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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 (807 views/month).[2]

Key Facts

  • Jefferson County is located in Colorado[3].
  • Jefferson County is in the country of United States[4].
  • Jefferson County's instance of is recorded as county of Colorado[5].
  • Jefferson County's capital is recorded as Golden[6].
  • Jefferson County's shares border with is recorded as Boulder County[7].
  • Jefferson County's shares border with is recorded as Broomfield County[8].
  • Jefferson County's shares border with is recorded as Adams County[9].
  • Jefferson County's shares border with is recorded as Denver County[10].
  • Jefferson County's shares border with is recorded as Arapahoe County[11].
  • Jefferson County's shares border with is recorded as Douglas County[12].
  • Jefferson County's shares border with is recorded as Teller County[13].
  • Jefferson County's shares border with is recorded as Park County[14].
  • Jefferson County's shares border with is recorded as Clear Creek County[15].
  • Jefferson County's shares border with is recorded as Gilpin County[16].
  • Thomas Jefferson is named after Jefferson County[17].
  • Jefferson County's Commons category is recorded as Jefferson County, Colorado[18].
  • 1861 marks the founding of Jefferson County[19].
  • Jefferson County's coordinate location is recorded as {'lat': 39.59, 'lon': -105.25}[20].
  • Jefferson County's official website is recorded as http://www.jeffco.us[21].
  • Jefferson County's topic's main category is recorded as Category:Jefferson County, Colorado[22].
  • Jefferson County has a population of {'amount': '+534543'}[23].
  • Jefferson County has a population of {'amount': '+535232'}[24].
  • Jefferson County has a population of {'amount': '+538878'}[25].
  • Jefferson County has a population of {'amount': '+545476'}[26].
  • Jefferson County has a population of {'amount': '+551798'}[27].

Body

Geography

Jefferson County is in the country of United States[4]. It is located in Colorado[3].

Physical Characteristics

Jefferson County covers an area of {'unit': 'Q712226', 'amount': '+2015'}[28]. Population counts include {'amount': '+534543'}[23], {'amount': '+535232'}[24], {'amount': '+538878'}[25], {'amount': '+545476'}[26], {'amount': '+551798'}[27], and {'amount': '+565524'}[29].

Designation and Status

Jefferson County's instance of is recorded as county of Colorado[5].

History and Context

1861 marks the founding of Jefferson County[19]. Thomas Jefferson is named after it[17].

Why It Matters

Jefferson County ranks in the top 3% of county_of_colorado entities by monthly Wikipedia readership (807 views/month).[2] It has Wikipedia articles in 24 language editions, a strong signal of global cultural recognition.[30] It is known by 22 alternative names across languages and contexts.[31]

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. [4] ↑ . archINFORM. Retrieved . wikidata.org.
  2. [5] ↑ . wikidata.org.
  3. [6] ↑ . wikidata.org.
  4. [7] ↑ . wikidata.org.
  5. [8] ↑ . wikidata.org.
  6. [9] ↑ . wikidata.org.
  7. [10] ↑ . wikidata.org.
  8. [11] ↑ . wikidata.org.
  9. [12] ↑ . wikidata.org.
  10. [13] ↑ . wikidata.org.
  11. [14] ↑ . wikidata.org.
  12. [15] ↑ . wikidata.org.
  13. [16] ↑ . wikidata.org.
  14. [3] ↑ . wikidata.org.
  15. [17] ↑ . wikidata.org.
  16. [18] ↑ . wikidata.org.
  17. [19] ↑ . wikidata.org.
  18. [20] ↑ . wikidata.org.
  19. [21] ↑ . wikidata.org.
  20. [22] ↑ . wikidata.org.
  21. [23] ↑ . 2010 United States Census. Retrieved . census.gov. Provenance: wikidata.org.
  22. [24] ↑ . census.gov. census.gov. Provenance: wikidata.org.
  23. [25] ↑ . census.gov. census.gov. Provenance: wikidata.org.
  24. [26] ↑ . census.gov. census.gov. Provenance: wikidata.org.
  25. [27] ↑ . census.gov. census.gov. Provenance: wikidata.org.
  26. [29] ↑ . Population Estimates Program. census.gov. Provenance: wikidata.org.
  27. [28] ↑ . wikidata.org.

Class ancestry

  1. [1] ↑ . Wikidata. wikidata.org.

Aggregate / graph-position facts

  1. [2] ↑ . Wikimedia Foundation. dumps.wikimedia.org.
  2. [30] ↑ . Wikidata sitelinks. wikidata.org.
  3. [31] ↑ . 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. 2d ago · Mxn · 2026-06-03 view diff on Wikidata ↗
    Domain name → jefferson.co.us
    "/* wbsetclaim-create:2||1 */ [[Property:P13337]]: jefferson.co.us"
  2. 12d ago · Mxn · 2026-05-24 view diff on Wikidata ↗
    Member of → Q138812596
    "/* wbcreateclaim-create:1| */ [[Property:P463]]: [[Q138812596]], [[:toollabs:quickstatements/#/batch/258464|batch #258464]]"
  3. 23d ago · Mahir256 · 2026-05-13 view diff on Wikidata ↗
    Umls cui → C3810768
    Country → United States
    Area → {'unit': 'Q712226', '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.