# Washington

> state of the United States of America

**Wikidata**: [Q1223](https://www.wikidata.org/wiki/Q1223)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Washington_(state))  
**Source**: https://4ort.xyz/entity/washington

## Summary
Washington is a U.S. state (commonly called Washington state, the Evergreen State, or WA) that was admitted to the United States on 1889-11-11. It is located in the United States (coordinates approx. 47.5° N, 120.5° W) and has the state capital Olympia.

## Key Facts
- Official classification: U.S. state (Wikidata description: "state of the United States of America").
- Inception (statehood): 1889-11-11T00:00:00Z.
- Common aliases: Evergreen State; WA; State of Washington; Washington State; Washington (state); US-WA.
- Capital city: Olympia (described as the federated state capital city; inception 1859-01-28T00:00:00Z).
- Coordinates: latitude 47.5, longitude -120.5.
- Official website: https://wa.gov/.
- Populations (listed values from source): 7,175,351.0; 7,705,281.0; 6,724,540.0; 5,894,121.0; 4,866,692.0; 4,132,156.0; 3,409,169.0; 2,853,214.0; 2,378,963.0; 1,736,191.0; 1,563,396.0; 1,356,621.0; 1,141,990.0; 75,116.0; 349,516.0; 11,594.0. (Source provided these numeric entries; years/contexts not specified in source.)
- Wikidata sitelink_count: 221 (as provided).
- Wikipedia title (as given): Washington (state).
- Preceded by: Washington Territory (inception +1853-01-01T00:00:00Z).
- Part of / Parent: contiguous United States (the 48 contiguous states and DC).
- Contains / Subsidiaries (as listed in source): contiguous United States (entry present in source material).
- Operated/Owned by (relationship present in source): Washington State Ferries operates automobile and passenger ferry service in Washington (inception +1951-00-00T00:00:00Z).
- Related classification: U.S. state (constituent political entity of the United States of America).
- Notable congressional districts listed in source: Washington's 1st, 2nd, 3rd, 4th, 5th, 6th, 7th, 8th, 10th congressional districts (each described as U.S. House districts in specified regions of the state).
- Major highways and interstates (from source): Interstate 5; Interstate 90 (inception +1956); Interstate 82 (inception +1957-10-17); Interstate 405; Interstate 205 (inception +1975); Interstate 705 (inception +1990); Interstate 182 (inception +1969-06-23); U.S. Route 101; U.S. Route 395; U.S. Route 99 (former; inception +1926); area code example: 206 serves Seattle, Washington.
- Major river listed: Columbia River (flows from British Columbia, through Washington, along Washington–Oregon border to the Pacific Ocean).
- Major volcanoes and peaks in the state (as listed): Mount Rainier; Mount St. Helens; Mount Adams; Mount Baker; Glacier Peak; Mount Spokane; Mount Shuksan; Mount Stuart; Mount Constance; Mount Despair; Mount Triumph; Mount Formidable; Mount Wow; Mount Anderson; Mount Fernow; Mount Christie; Mount Pilchuck; Mount Index; Mount Terror; Mount Redoubt; Mount Logan; Mount Challenger; Mount Ernest (where present in source); Little Tahoma Peak; Little Si; Bonanza Peak; Jack Mountain; Glacier and other named glaciers (Carbon Glacier, Emmons Glacier, Kautz Glacier, Nisqually Glacier, Puyallup Glacier, South Mowich Glacier, North Mowich Glacier, East Nooksack Glacier, Crater Glacier, etc.).
- Major protected areas and wildernesses from source: Olympic National Forest; Mount Baker–Snoqualmie National Forest; Colville National Forest; Okanogan–Wenatchee National Forest; Alpine Lakes Wilderness; Pasayten Wilderness; Henry M. Jackson Wilderness; Goat Rocks Wilderness; Juniper Dunes Wilderness; Boulder River Wilderness; Colonel Bob Wilderness; Indian Heaven Wilderness; Goat Rocks; Cascade Range and Olympic Mountains (regional features).
- Major water bodies, bays, sounds, and straits from source: Puget Sound; Elliott Bay; Admiralty Inlet; Hood Canal; Commencement Bay; Grays Harbor; Bellingham Bay; Elliott Bay; Salish Sea; Strait of Juan de Fuca; Haro Strait; Rosario Strait; Semiahmoo Bay; Boundary Bay; Tacoma Narrows; Deception Pass; Commencement Bay; Hood Canal; Willapa Bay.
- Notable cities and metro areas in source: Seattle (multiple references including Seattle Municipal Tower, Seattle SuperSonics, Seattle Symphony, KOMO-TV, Original Starbucks); Seattle metropolitan area; Portland metropolitan area (spanning Oregon and Washington); Tri-Cities (served by Tri-Cities Airport); Vancouver (Pearson Field in Vancouver, Washington).
- Major transportation infrastructure and carriers in source: Sound Transit; Sounder commuter rail; Washington State Department of Transportation (inception +1964-01-01; employees 7,200.0 in source); Washington State Ferries (inception +1951).
- Airports named in source: Spokane International Airport; Boeing Field; Renton Municipal Airport; Tri-Cities Airport; Pangborn Memorial Airport; Grant County International Airport; Pullman–Moscow Regional Airport; Seattle-area and other regional airports listed (Kenmore Air Harbor, Kenmore Air Harbor Seaplane Base, Boeing Field, Felts Field, Bellingham-area airports, Anacortes Airport, Orcas Island Airport, Lopez Island Airport, Friday Harbor Seaplane Base, Quillayute Airport, etc.).
- Major dams and hydroelectric works listed: Rock Island Dam (inception +1930), Rocky Reach Dam (inception +1956), Priest Rapids Dam (inception +1956), John Day Dam (on Columbia River; inception +1959), Mossyrock Dam, Tieton Dam, Alder Dam.
- Notable research & cultural institutions included in source: Allen Institute for Brain Science (headquartered Seattle; inception 2003 referenced), Pacific Northwest National Laboratory (inception +1965; headquarters ); The Museum of Flight; Frye Art Museum; Museum of Glass; Evergreen State College (inception +1967; employees 660.0 listed); University of Washington (station entry).
- Selected organizations and companies noted in source with Washington ties: Boeing (Boeing Field); Expedia Group (headquarters listed as  — Seattle); Funko (headquarters in Washington listed); Soundgarden and other cultural acts linked to the state; Sea Shepherd Conservation Society (headquarters include , ,  references).
- Native peoples and tribes named in source: Snoqualmie Indian Tribe; Snohomish tribe; Suquamish Tribe; Muckleshoot people; Nooksack people; Quinault people; Quileute people; Hoh Indian Tribe; Skokomish tribe; Kalispel; Salish peoples; Wanapum; Skagit; Puyallup-related mentions.
- Islands and island groups in source: San Juan Islands (Orcas Island, Lopez Island, Guemes Island, Tatoosh Island, Maury Island, Vashon Municipal references), Fidalgo Island, Anderson Island, Ketron Island, Fir Island, Maury Island, Tanglewood Island.
- Bridges and notable structures listed: Astoria–Megler Bridge (connects Washington and Oregon); Evergreen Point Floating Bridge (opened 1963; inception +1963-08-28); Bank of America Fifth Avenue Plaza and 1201 Third Avenue skyscrapers in Seattle.
- Sports, culture and entertainment references cited: Seattle SuperSonics (inception +1967; former team); Seattle Seahawks Ring of Honor (inception 1989 referenced); The Gorge Amphitheatre; Sakura-Con; BrickCon; music acts (Soundgarden, Bikini Kill).
- Natural phenomena and events referenced: Great Fire of 1910 (affecting the northwestern United States); Oso mudslide (2014 landslide east of Oso, Washington); 2015 Washington wildfires; 2016 Cascade Mall shooting; 2018 Horizon Air  incident.
- Other transportation and infrastructure items listed: Empire Builder Amtrak service; Cascade Tunnel (inception +1900-12-20); various state routes (Washington State Route 16, 99, 8, 339) and U.S. highways (US 101, US 395, etc.).
- Geographic regions identified in source: Olympic Peninsula; Puget Sound region; Columbia Basin; Columbia Plateau; Palouse; Eastern Washington; Western Washington; Pacific Northwest.

## FAQs
Q: Where is Washington located and what is it?
A: Washington is a U.S. state in the United States, located in the Pacific Northwest region of North America (coordinates approx. 47.5° N, 120.5° W). It is one of the 50 states and part of the contiguous United States.

Q: When did Washington become a state and what preceded it?
A: Washington’s statehood inception date in the provided material is 1889-11-11. It was preceded by Washington Territory, which existed with inception +1853-01-01T00:00:00Z.

Q: What is the capital of Washington?
A: The capital is Olympia, identified in the source as the federated state capital city of Washington (inception 1859-01-28T00:00:00Z).

Q: What are some major geographic features in Washington?
A: Major features named in the source include the Cascade Range, Olympic Mountains, Puget Sound, Salish Sea, Columbia River, Mount Rainier, Mount St. Helens, Olympic Peninsula, and numerous rivers, bays, glaciers, and islands.

Q: Which transportation systems and major highways serve Washington?
A: The state contains Interstates I-5, I-90, I-82, I-405, I-205, I-705, and I-182 among others; U.S. Routes 101, 395, and historical US 99; rail services such as the Empire Builder and Sounder commuter rail; Washington State Department of Transportation and Washington State Ferries operate major transport infrastructure.

Q: Which counties, municipalities, or regions are part of Washington according to the source?
A: Counties and regions named include King County, Pierce County, Snohomish County, Spokane County, Yakima County, Benton County, Columbia County, Garfield County, Grant County, Skagit County, Kittitas County, Lewis County, Clark County, Whitman County, Chelan County, Franklin County, Adams County, Asotin County, Okanogan County, Skamania County, Thurston County, Mason County, Kitsap County, Island County, Jefferson County, Wahkiakum County, Klickitat County, San Juan County, Walla Walla County, Lincoln County, Pend Oreille County, Stevens County, and others.

Q: What major institutions and research centers operate in Washington?
A: Research and cultural institutions listed include the Allen Institute for Brain Science (Seattle), Pacific Northwest National Laboratory, The Museum of Flight, Museum of Glass, Evergreen State College, and major corporate headquarters referenced (Expedia Group, Funko), among other organizations.

Q: Who are some Native peoples associated with Washington in the provided data?
A: The source lists the Snoqualmie Indian Tribe, Snohomish tribe, Suquamish Tribe, Muckleshoot people, Nooksack people, Quinault people, Quileute people, Hoh Indian Tribe, Skokomish tribe, Kalispel, Salish peoples, Skagit, Nisqually, and others.

## Why It Matters
Washington matters because it aggregates a wide range of geographic, ecological, cultural, transportation, and scientific assets within a single U.S. state. The state contains significant Pacific Northwest landforms—the Cascade Range and Olympic Mountains—and major volcanic peaks such as Mount Rainier and Mount St. Helens, which shape regional hydrology (Columbia River and its tributaries), climate zones (coastal Puget Sound vs. interior basins), and national park and wilderness networks (Alpine Lakes Wilderness, Olympic National Forest, Mount Baker–Snoqualmie NF, Okanogan–Wenatchee NF). Washington’s maritime geography includes Puget Sound and the Salish Sea, supporting ferry systems (Washington State Ferries) and major ports.

Transportation and infrastructure corridors—Interstate highways, Amtrak services like the Empire Builder, multiple regional and international airports (Spokane International, Boeing Field, Tri-Cities Airport)—connect Washington internally and to the rest of the U.S. and Canada. The state hosts research institutions (Allen Institute, Pacific Northwest National Laboratory) and cultural institutions (Seattle Symphony, museums) that contribute to scientific, cultural, and economic activity. Washington’s network of dams and hydro projects (Rock Island, Rocky Reach, Priest Rapids, John Day) underpins major hydroelectric and water-resource systems tied to the Columbia River. Washington’s diverse indigenous nations and tribal entities are an integral cultural and political part of the state’s identity and governance. Collectively, these elements make Washington influential in regional ecology, transportation, research, culture, and resource management in the Pacific Northwest.

## Notable For
- Being commonly called the Evergreen State and using multiple short forms and aliases (WA; Washington State; Washington (state); US-WA).
- Statehood date recorded in source as 1889-11-11T00:00:00Z and direct predecessor Washington Territory (inception +1853-01-01).
- Hosting prominent volcanoes and peaks listed in the source: Mount Rainier and Mount St. Helens among many named summits and glaciers (Carbon Glacier, Emmons Glacier, Crater Glacier, etc.).
- Containing Puget Sound and the Salish Sea region, with many named bays, straits, and island groups (Elliott Bay, Bellingham Bay, Admiralty Inlet, Strait of Juan de Fuca, San Juan Islands).
- Extensive protected lands and wilderness areas cited: Alpine Lakes Wilderness, Pasayten Wilderness, Henry M. Jackson Wilderness, Mount Baker–Snoqualmie National Forest, Okanogan–Wenatchee National Forest, Olympic National Forest.
- A comprehensive ferry and marine transport system operated by Washington State Ferries (inception +1951).
- Multiple major transportation corridors and interstates crossing the state, including I-5 and I-90, and important rail services like the Empire Builder.
- Presence of major research institutions and cultural organizations: Allen Institute for Brain Science (Seattle), Pacific Northwest National Laboratory, The Museum of Flight, Seattle Symphony.
- Numerous named counties, rivers, lakes, airports, dams, and conservation units listed in the source, reflecting geographic diversity and infrastructure concentration.

## Body

### Overview and Identity
- Washington is a U.S. state (Wikidata description: "state of the United States of America") with the provided Wikipedia title "Washington (state)".  
- Common aliases and short forms include Evergreen State; WA; State of Washington; Washington State; Washington (state); US-WA.  
- The state’s official web portal as listed is https://wa.gov/.  
- Coordinates provided: latitude 47.5, longitude -120.5.  
- The state's Wikidata sitelink_count in the source is 221.

### History and Political Status
- Inception / statehood: 1889-11-11T00:00:00Z (the date presented as Washington’s inception in the structured properties).  
- Predecessor entity: Washington Territory (described as a U.S. territory between 1853–1889; inception +1853-01-01T00:00:00Z).  
- Capital: Olympia (described as the city in and county seat of Thurston County, Washington, and the federated state capital city; inception +1859-01-28T00:00:00Z).

### Administrative and Congressional Divisions
- U.S. House districts referenced in source include: Washington's 1st congressional district (northwestern Washington), 2nd, 3rd, 4th (central Washington), 5th (eastern Washington), 6th (western Washington), 7th (containing most of Seattle), 8th (west central Washington), and 10th (centered on Olympia).  
- Counties listed in source (selected with inception dates where provided): King County (inception +1852-12-22; headquarters ); Pierce County (inception +1852-12-22); Snohomish County (inception +1861-01-14); Yakima County (inception +1865); Skagit County (inception +1883); Kittitas County (inception +1883); Grant County (inception +1909); Benton County (inception +1905); Columbia County (inception +1875); Garfield County (inception +1881); Ferry County (inception +1899); Okanogan County (inception +1888); Jefferson County (inception +1852); Wahkiakum County (inception +1854); Whitman County (inception +1871); Chelan County (inception +1899); Franklin County (inception +1883); Adams County (inception +1883); Asotin County (inception +1883); Lincoln County (inception +1883-11-24); San Juan County (inception +1873); Skamania County (inception +1854-03-09); Mason County (inception +1854-03-13); Kitsap County (inception +1857); Island County (inception +1853); Pend Oreille County (inception +1911); Stevens County (inception +1863-01-20); Lewis County (inception +1845-12-19); Klickitat County (inception +1859); Wahkiakum, Walla Walla, and others are similarly listed.

### Geography: Regions, Coasts, and Bodies of Water
- Coastal and marine features: Puget Sound (sound along Washington’s northwestern coast); Elliott Bay (bay of Puget Sound at Seattle); Admiralty Inlet (strait connecting Strait of Juan de Fuca to Puget Sound); Hood Canal (fjord off Puget Sound); Commencement Bay (site of Tacoma); Tacoma Narrows; Deception Pass (strait between Whidbey and Fidalgo Islands).  
- Salish Sea and cross-border waters: Salish Sea (marginal sea including parts of Washington and British Columbia); Boundary Bay and Semiahmoo Bay (straddling the international border). Haro Strait and Rosario Strait connect British Columbia and Washington waters.  
- Major rivers: Columbia River (flows from British Columbia through Washington and along the WA–OR border to the Pacific Ocean); Yakima River; Skagit River (tributary to Skagit Bay in BC and Washington); Snohomish River; Spokane River; Walla Walla River; Wenatchee River; Chehalis River; Cowlitz River; Puyallup River; Kettle River; Yakima River tributaries (Naches River, Tieton River, Cle Elum River, Kachess River). Specific tributaries and named watercourses are listed throughout the source (e.g., Skykomish River, Nooksack River, Salmonier entries, etc.).  
- Lakes, reservoirs, and bays: Lake Chelan; Lake Sammamish; Lake Whatcom; Lake Quinault; Diablo Lake; Ross Lake (shared with British Columbia); Potholes Reservoir; Grays Harbor; Willapa Bay; Bellingham Bay; Commencement Bay; Lake Crescent; Mowich Lake; many smaller named lakes and reservoirs.

### Mountains, Volcanoes, Glaciers, and Ranges
- Major volcanoes named in the source: Mount Rainier (stratovolcano); Mount St. Helens (volcano in Washington state); Mount Adams; Mount Baker; Mount Hood is not listed in the provided material for Washington (it is in Oregon) — the source lists many Washington peaks and glaciers.  
- Mountain ranges and subranges present in the data: Cascade Range (western North America); Olympic Mountains; Skagit Range; Wenatchee Mountains; Tatoosh Range; Goat Rocks; Picket Range; Entiat Mountains; Chiwaukum Mountains; Chuckanut Mountains; Stuart Range; Hozomeen Range; Hozameen Range; Monashee Mountains (cross-border); Blue Mountains (southeastern Washington region); Saddle Mountains; Willapa Hills.  
- Named peaks and mountains cited: Bonanza Peak; Jack Mountain; Mount Shuksan; Mount Stuart; Mount Constance; Mount Triumph; Mount Spickard; Mount Formidable; Mount Despair; Mount Index; Mount Snoqualmie-related peaks; Mount Tom and many more listed in the source.  
- Glaciers specifically listed: Carbon Glacier, Emmons Glacier, Kautz Glacier, Nisqually Glacier, Puyallup Glacier, North Mowich Glacier, South Mowich Glacier, East Nooksack Glacier, Crater Glacier (on Mount St. Helens), Winthrop Glacier, Sahale Glacier, Coleman Glacier, Quien Sabe Glacier, and others.

### Protected Lands, Parks and Wilderness Areas
- National and state protected areas referenced include: Olympic National Forest; Mount Baker–Snoqualmie National Forest; Okanogan–Wenatchee National Forest; Colville National Forest; Alpine Lakes Wilderness (inception +1976); Pasayten Wilderness (inception +1964); Henry M. Jackson Wilderness; Goat Rocks Wilderness (inception +1964); Juniper Dunes Wilderness (inception +1984); Indian Heaven Wilderness (inception +1984); Colonel Bob Wilderness; Goat Rocks; Capitol State Forest; Dungeness National Wildlife Refuge; Columbia National Wildlife Refuge; Conboy Lake National Wildlife Refuge; Nez Perce National Historical Park (multi-state, inception +1965-05-15).

### Rivers, Waterfalls, and Hydrology
- Numerous waterfalls and named falls appear in the source: Sulphide Creek Falls; Upper Stevens Creek Falls; Marymere Falls; Snoqualmie Falls; Rainbow and Twin Falls entries; Franklin Falls; Canyon Falls; many smaller waterfall entries like Bear Creek Falls, Rainy Lake Falls, etc.  
- Hydroelectric and dam structures: Rock Island Dam (inception +1930); Rocky Reach Dam (inception +1956); Priest Rapids Dam (inception +1956); John Day Dam (on Columbia River; inception +1959); Mossyrock Dam; Tieton Dam; Alder Dam; Priest Rapids; Swift Dam (inception +1956); other dams and reservoirs are listed.

### Islands, Straits, and Peninsulas
- Olympic Peninsula (northwest corner of Washington); Long Beach Peninsula; San Juan Islands with specific islands named: Orcas Island (largest of San Juans), Lopez Island, Guemes Island, Tatoosh Island, Maury Island, Ketron Island; Fidalgo Island; Anderson Island; Fir Island; Vashon/Harbor islands and small island airfields are referenced.

### Transportation, Ports, Airports, and Infrastructure
- Intercity rail and roads: Empire Builder (Amtrak service between Chicago and the Pacific Northwest); Cascade Tunnel; numerous interstates and U.S. routes noted in Key Facts.  
- Airports named across the source: Spokane International Airport; Boeing Field; Renton Municipal Airport; Tri-Cities Airport; Pangborn Memorial Airport; Grant County International Airport; Pullman–Moscow Regional Airport; Anacortes Airport; Orcas Island Airport; Lopez Island Airport; Friday Harbor Seaplane Base; Quillayute Airport; Kenmore Air Harbor; Kenmore Air Harbor Seaplane Base; Tri-Cities and regional airport listings.  
- Ferry and maritime operations: Washington State Ferries (government agency, inception +1951) operates automobile and passenger ferry service across Puget Sound and adjoining waters.  
- Transit agencies and commuter rail: Sound Transit; Sounder commuter rail; Sounder and other regional transit services are mentioned.

### Economy, Research, and Institutions
- Research organizations in the source: Allen Institute for Brain Science (headquartered Seattle; inception 2003 referenced); Pacific Northwest National Laboratory (inception +1965; employees 6,089.0 listed in source context).  
- Companies and corporate ties in the source: Expedia Group (American-based parent company; inception +1996-10-22; headquarters  — Seattle); Funko (inception +1998-10-23; country Q30; headquarters , ); Kulicke & Soffa Industries (headquarters Washington as listed); Boeing-related infrastructure named (Boeing Field).  
- Cultural institutions: The Museum of Flight (inception +1965-01-01), Museum of Glass (inception +2002-01-01), Frye Art Museum (inception +1952-01-01), Seattle Symphony (inception +1903-01-01).

### Culture, Sports and Entertainment
- Sports teams and cultural groups referenced: Seattle SuperSonics (former NBA team; inception +1967); Seattle Symphony; Seattle Seahawks Ring of Honor (inception 1989 referenced); concert venue The Gorge Amphitheatre; music acts and events like Soundgarden, Bikini Kill, Sakura-Con, BrickCon.  
- Historical events and incidents: Great Seattle Fire (1889); Great Fire of 1910 (wildfire in the northwestern United States); Oso mudslide (2014); Cascade Mall shooting (2016); 2018 Horizon Air  incident.

### Indigenous Nations and Tribal Entities
- Listed tribes and peoples: Snoqualmie Indian Tribe (federally recognized in Washington State); Snohomish tribe; Suquamish Tribe; Muckleshoot people; Nooksack people; Quinault people; Quileute people; Hoh Indian Tribe; Skokomish tribe; Kalispel; Salish peoples; Skagit; Nisqually; Wanapum; Chehalis people. Many of these are listed with country Q30 (United States) in the source.

### Cities, Towns, and Communities
- Urban and community references in source include Seattle (numerous references to buildings, institutions, and cultural items), Tacoma (Commencement Bay), Bellevue (Seattle Washington Temple mention), Olympia (state capital), Vancouver (Pearson Field), Bellingham (Bellingham Bay), Port Angeles (William R. Fairchild International Airport), George (location of The Gorge Amphitheatre), and many smaller census-designated places and unincorporated communities cited (Sekiu, Ozette, Diablo, etc.).

### Conservation, Ecology and Ecoregions
- Ecoregions and ecological features cited: Central Pacific coastal forests (WWF); Hoh Rainforest and Olympic Peninsula rainforests are named; Columbia Basin and Columbia Plateau referenced as major drainage basin/plateau ecosystems.

### Notable Built Structures and Landmarks
- Landmarks named include: Evergreen Point Floating Bridge (opened 1963; inception +1963-08-28), Bank of America Fifth Avenue Plaza (Office skyscraper in Seattle), Seattle Municipal Tower (inception +1990), 1201 Third Avenue, and other skyscrapers and civic structures listed.

### Miscellaneous Specific Entities and Local Features (select list drawn from source)
- Waterfalls: Sulphide Creek Falls; Upper Stevens Creek Falls; Bear Creek Falls; Twin Falls; Denny Camp Falls; Rainy Lake Falls; Upper Comet Falls; Upper Weeks Falls; Middle Twin Falls; Nellie Falls; Franklin Falls; Canyon Falls; Madison Creek Falls; Asbestos Falls; Madison Creek Falls.
- Mountains and peaks: Mount Blum; Mount Duckabush; Mount Erie; Mount Index; Mount Shuksan; Mount Stuart; Mount Adams; Mount Baker; Mount Rainier; Mount St. Helens; Mount Terror; Daisy named peaks such as Cathedral/College peaks appear across the source.
- Rivers and tributaries: Skagit River; Spokane River; Snoqualmie River; Skykomish River; Snohomish River; Nooksack River; Duwamish River; Stillaguamish River; Palouse area rivers; Klickitat River; Chelan River; Entiat River; Naches River; Tieton River; Yakima River and its tributaries (Kachess, Cle Elum, etc.); Columbia River tributaries including the Cowlitz River.
- Islands and passages: Fidalgo Island; Deception Pass; Tatoosh Island; Dungeness Spit; Haro Strait; Strait of Georgia (cross-border).
- Airports and airfields: Kenmore Air Harbor; Kenmore Air Harbor Seaplane Base; Renton Municipal Airport; Boeing Field; Tri-Cities Airport; Spokane International Airport; Pangborn Memorial Airport; Grant County International Airport; Pullman–Moscow Regional Airport; Walla Walla Regional Airport; Anacortes Airport; Orcas Island Airport; Lopez Island Airport; Friday Harbor Seaplane Base; Quillayute Airport; Grant and regional airfields listed in the source.
- Dams and reservoirs: Rock Island Dam; Rocky Reach Dam; Priest Rapids Dam; John Day Dam; Mossyrock Dam; Tieton Dam; Alden/Alder Dam; Potholes Reservoir; Diablo Reservoir; Ross Lake.
- Other named sites and institutions: Evergreen State College; Allen Institute for Brain Science; Pacific Northwest National Laboratory; Sound Transit; Washington State Department of Transportation; Washington State Ferries; Museum of Glass; The Museum of Flight; Point Defiance Zoo & Aquarium.
- Cultural and entertainment items: Original Starbucks (coffeehouse in Seattle); Seattle SuperSonics (former team), Soundgarden (band), Bikini Kill (band), Sakura-Con (anime convention), BrickCon (LEGO convention), The Gorge Amphitheatre.

### Cross-Border and Regional Context
- Several features span or border Canada (British Columbia) and Washington, as noted in the source: the Columbia River (originates in BC and flows through WA), Boundary Bay and Semiahmoo Bay (straddle international border), Skagit Range and Monashee/Monashee Mountains cross the Canada–U.S. border, Okanogan Range and others list both Q16 (Canada) and Q30 (U.S.).

### Data Notes and Source-Provided Numerics
- The structured properties included a series of population numbers and other numeric entries without explicit year labels in the provided material. Those numbers are reproduced in the Key Facts section as presented in the source.  
- Inception dates for many infrastructure and governmental entities are included where provided by the source (examples: Washington State Department of Transportation inception +1964-01-01T00:00:00Z; Evergreen Point Floating Bridge +1963-08-28).

### Related Entities and “Related” List from Source
- The raw material lists many related entities and organizations that are located in, operate in, or are directly associated with Washington. That list includes (but is not limited to) airports, counties, rivers, mountain ranges, wilderness areas, research institutes, cultural organizations, sports teams, companies, transportation agencies, Native tribes, and specific geographic features named throughout this Body section. Each named entity in the source appears above in the relevant topical subsection.

### Governance and Agencies (selected)
- Washington State Department of Transportation — government agency in Washington (inception +1964-01-01T00:00:00Z; employees 7,200.0; headquarters  as listed).  
- Washington State Ferries — government agency operating automobile and passenger ferry service in the state (inception +1951-00-00T00:00:00Z).  
- Local and regional transit agencies referenced include Sound Transit and Sounder commuter rail.

### Events, Incidents, and Historical Notes
- The source contains references to several historical events and incidents occurring in or associated with Washington: Great Seattle Fire (1889); Great Fire of 1910 (regional wildfire); Oso mudslide (2014); 2015 Washington wildfires; Cascade Mall shooting (2016); Wellington, Washington avalanche/train wreck; 2018 Horizon Air  incident.

### Closing Geographic and Cultural Context
- Washington is embedded in the larger Pacific Northwest and contiguous United States contexts. It contains diverse landscapes from coastal straits and islands to high Cascade volcanoes and interior plateaus. The state’s listed facilities, institutions, tribes, protected areas, transportation networks, and cultural organizations demonstrate its role as a complex and multifaceted U.S. state with extensive internal and cross-border geographic, ecological, transportation, and cultural linkages as reflected in the provided source material.

(Note: All names, dates, numeric values, and relationships above are taken directly from the provided source material and presented without additional external inference.)

## References

1. Gazetteer
2. Medical Subject Headings
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13. [Population Estimates Program](https://www.census.gov/programs-surveys/popest.html)
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31. [Source](https://ftp.arin.net/pub/resource_registry_service/asns.csv)
32. Enciclopedia Treccani
33. [2016–2020 American Community Survey](https://data.census.gov/cedsci/table?t=Income%20and%20Poverty&g=0100000US,%241600000&tid=ACSST5Y2020.S1902)
34. Google News
35. [archINFORM](https://www.archinform.net/service/wd_aiort.php)
36. Dizionario di Storia
37. [Source](https://www.minimum-wage.org/wage-by-state)
38. [Source](https://encyklopedia.pwn.pl/haslo/Waszyngton;3994269.html)
39. [iNaturalist](https://www.inaturalist.org/places/inaturalist-places.csv.zip)
40. Golden
41. [Source](https://github.com/opencivicdata/ocd-division-ids/blob/1be9a1a8e83af5274515fca52cc7875d75174129/identifiers/country-us/states.csv)
42. museum-digital