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Jefferson County

county in Colorado, United States
AdministrativeArea county_of_colorado Q127978
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Jefferson County

Summary

Jefferson County is a county of Colorado[1]. It ranks in the top 3% of county_of_colorado entities by monthly Wikipedia readership (1,611 views/month).[2]

Key Facts

  • Jefferson County was a member of GovAI Coalition[3].
  • Jefferson County is located in Colorado[4].
  • Jefferson County is in the country of United States[5].
  • Jefferson County's instance of is recorded as county of Colorado[6].
  • Jefferson County's capital is recorded as Golden[7].
  • Jefferson County's shares border with is recorded as Boulder County[8].
  • Jefferson County's shares border with is recorded as Broomfield County[9].
  • Jefferson County's shares border with is recorded as Adams County[10].
  • Jefferson County's shares border with is recorded as Denver County[11].
  • Jefferson County's shares border with is recorded as Arapahoe County[12].
  • Jefferson County's shares border with is recorded as Douglas County[13].
  • Jefferson County's shares border with is recorded as Teller County[14].
  • Jefferson County's shares border with is recorded as Park County[15].
  • Jefferson County's shares border with is recorded as Clear Creek County[16].
  • Jefferson County's shares border with is recorded as Gilpin County[17].
  • Thomas Jefferson is named after Jefferson County[18].
  • Jefferson County's Commons category is recorded as Jefferson County, Colorado[19].
  • 1861 marks the founding of Jefferson County[20].
  • Jefferson County's coordinate location is recorded as {'latitude': 39.59, 'longitude': -105.25}[21].
  • Jefferson County's official website is recorded as http://www.jeffco.us[22].
  • Jefferson County's topic's main category is recorded as Category:Jefferson County, Colorado[23].
  • Jefferson County has a population of {'amount': '+534543'}[24].
  • Jefferson County has a population of {'amount': '+535232'}[25].
  • Jefferson County has a population of {'amount': '+538878'}[26].
  • Jefferson County has a population of {'amount': '+545476'}[27].

Body

Geography

Jefferson County is in the country of United States[5]. It is located in Colorado[4].

Physical Characteristics

Jefferson County covers an area of {'amount': '+2015'}[28]. Population counts include {'amount': '+534543'}[24], {'amount': '+535232'}[25], {'amount': '+538878'}[26], {'amount': '+545476'}[27], {'amount': '+551798'}[29], and {'amount': '+565524'}[30].

Designation and Status

Jefferson County's instance of is recorded as county of Colorado[6].

History and Context

1861 marks the founding of Jefferson County[20]. Thomas Jefferson is named after it[18].

Why It Matters

Jefferson County ranks in the top 3% of county_of_colorado entities by monthly Wikipedia readership (1,611 views/month).[2] It has Wikipedia articles in 24 language editions, a strong signal of global cultural recognition.[31] It is known by 42 alternative names across languages and contexts.[32]

Related Entities

Colorado Pieusse Thomas Jefferson United States

References

Programmatic citations — every numbered marker resolves to a verifiable graph row below.

Direct Wikidata claims

  1. [5] ↑ . wikidata.org.
  2. [6] ↑ . wikidata.org.
  3. [7] ↑ . wikidata.org.
  4. [8] ↑ . wikidata.org.
  5. [9] ↑ . wikidata.org.
  6. [10] ↑ . wikidata.org.
  7. [11] ↑ . wikidata.org.
  8. [12] ↑ . wikidata.org.
  9. [13] ↑ . wikidata.org.
  10. [14] ↑ . wikidata.org.
  11. [15] ↑ . wikidata.org.
  12. [16] ↑ . wikidata.org.
  13. [17] ↑ . wikidata.org.
  14. [4] ↑ . wikidata.org.
  15. [18] ↑ . wikidata.org.
  16. [19] ↑ . wikidata.org.
  17. [3] ↑ . wikidata.org.
  18. [20] ↑ . wikidata.org.
  19. [21] ↑ . wikidata.org.
  20. [22] ↑ . wikidata.org.
  21. [23] ↑ . wikidata.org.
  22. [24] ↑ . wikidata.org.
  23. [25] ↑ . wikidata.org.
  24. [26] ↑ . wikidata.org.
  25. [27] ↑ . wikidata.org.
  26. [29] ↑ . wikidata.org.
  27. [30] ↑ . wikidata.org.
  28. [28] ↑ . wikidata.org.

Class ancestry

  1. [1] ↑ . Wikidata. wikidata.org.

Aggregate / graph-position facts

  1. [2] ↑ . Wikimedia Foundation. dumps.wikimedia.org.
  2. [31] ↑ . Wikidata sitelinks. wikidata.org.
  3. [32] ↑ . Wikidata aliases. wikidata.org.

📑 Cite this page

Use these citations when quoting this entity in research, articles, AI prompts, or wherever provenance matters. We aggregate Wikidata + Wikipedia + authoritative open-data sources; the stitched, scored, cross-referenced view is what 4ort.xyz contributes.

APA 4ort.xyz Knowledge Graph. (2026). Jefferson County. Retrieved May 3, 2026, from https://4ort.xyz/entity/jefferson-county-q127978
MLA “Jefferson County.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/jefferson-county-q127978.
BibTeX @misc{4ortxyz_jefferson-county-q127978_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{Jefferson County}}, year = {2026}, url = {https://4ort.xyz/entity/jefferson-county-q127978}, note = {Accessed: 2026-05-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): Jefferson County — https://4ort.xyz/entity/jefferson-county-q127978 (retrieved 2026-05-03)

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Edit History

Rolling log of changes to this entity's Wikidata record. Values shown reflect the current state of each edited property — follow the history link to see the precise diff for any edit.

  1. 18d ago · Theklan · 2026-09-04 view diff on Wikidata ↗
    P14687 → Data:US presidential elections by county/Jefferson County, C
    "/* wbsetclaim-create:2||1 */ [[Property:P14687]]: Data:US presidential elections by county/Jefferson County, Colorado.tab, Link US presidential election dataset (P14687, subject: United States preside"
  2. 15w ago · Mxn · 2026-06-03 view diff on Wikidata ↗
    Domain name → jefferson.co.us
    "/* wbsetclaim-create:2||1 */ [[Property:P13337]]: jefferson.co.us"
  3. 17w ago · Mxn · 2026-05-24 view diff on Wikidata ↗
    Member of → GovAI Coalition
    "/* wbcreateclaim-create:1| */ [[Property:P463]]: [[Q138812596]], [[:toollabs:quickstatements/#/batch/258464|batch #258464]]"
  4. 18w ago · Mahir256 · 2026-05-13 view diff on Wikidata ↗
    Umls cui → C3810768
    Country → United States
    Area → {'amount': '+2015'}
    Obo gazetteer id → 22224727
    + 32 other properties edited (see Wikidata diff for full list)
    "/* wbeditentity-update:0| */ QuickStatements 3.0 [[:toollabs:qs-dev/batch/31546|batch #31546]]"
Live feed via Wikidata EventStreams. New edits appear within minutes of being made on Wikidata.