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Contra Costa County

county in California, United States
Organization county_of_california Q108058
Contra Costa County
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Contra Costa County

Summary

Contra Costa County is a county of California[1]. It draws 3,595 Wikipedia views per month (county_of_california category, ranking #13 of 58).[2]

Key Facts

  • Contra Costa County is located in California[3].
  • Contra Costa County is in the country of United States[4].
  • Contra Costa County's instance of is recorded as county of California[5].
  • Contra Costa County's capital is recorded as Martinez[6].
  • Contra Costa County's shares border with is recorded as Alameda County[7].
  • Contra Costa County's shares border with is recorded as Solano County[8].
  • Contra Costa County's shares border with is recorded as Sacramento County[9].
  • Contra Costa County's shares border with is recorded as San Joaquin County[10].
  • opposite coast is named after Contra Costa County[11].
  • Contra Costa County's contains the administrative territorial entity is recorded as Martinez[12].
  • Contra Costa County's contains the administrative territorial entity is recorded as Concord[13].
  • Contra Costa County's contains the administrative territorial entity is recorded as Richmond[14].
  • Contra Costa County's headquarters location is recorded as Martinez[15].
  • Contra Costa County is part of Oakland–Fremont–Berkeley metropolitan division[16].
  • Contra Costa County's Commons category is recorded as Contra Costa County, California[17].
  • 1850 marks the founding of Contra Costa County[18].
  • Contra Costa County's coordinate location is recorded as {'latitude': 37.93, 'longitude': -121.95}[19].
  • Contra Costa County's authority is recorded as County of Contra Costa[20].
  • Contra Costa County's official website is recorded as http://www.contracosta.ca.gov[21].
  • Contra Costa County's official website is recorded as https://www.contracosta.ca.gov/[22].
  • Contra Costa County's topic's main category is recorded as Category:Contra Costa County, California[23].
  • Contra Costa County has a population of {'amount': '+1049025'}[24].
  • Contra Costa County has a population of {'amount': '+1052700'}[25].
  • Contra Costa County has a population of {'amount': '+1065917'}[26].
  • Contra Costa County has a population of {'amount': '+1078257'}[27].

Body

Founding

1850 marks the founding of Contra Costa County[18].

Identity

Contra Costa County is part of Oakland–Fremont–Berkeley metropolitan division[16].

Operations

Contra Costa County's headquarters location is recorded as Martinez[15].

Why It Matters

Contra Costa County draws 3,595 Wikipedia views per month (county_of_california category, ranking #13 of 58).[2] It has Wikipedia articles in 25 language editions, a strong signal of global cultural recognition.[28] It is known by 39 alternative names across languages and contexts.[29]

Related Entities

California Taichung United States

References

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

Direct Wikidata claims

  1. [4] ↑ . 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. [3] ↑ . wikidata.org.
  9. [11] ↑ . wikidata.org.
  10. [12] ↑ . wikidata.org.
  11. [13] ↑ . wikidata.org.
  12. [14] ↑ . wikidata.org.
  13. [15] ↑ . wikidata.org.
  14. [16] ↑ . 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] ↑ . wikidata.org.
  22. [24] ↑ . wikidata.org.
  23. [25] ↑ . wikidata.org.
  24. [26] ↑ . wikidata.org.
  25. [27] ↑ . wikidata.org.

Class ancestry

  1. [1] ↑ . Wikidata. wikidata.org.

Aggregate / graph-position facts

  1. [2] ↑ . Wikimedia Foundation. dumps.wikimedia.org.
  2. [28] ↑ . Wikidata sitelinks. wikidata.org.
  3. [29] ↑ . 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). Contra Costa County. Retrieved April 10, 2026, from https://4ort.xyz/entity/contra-costa-county
MLA “Contra Costa County.” 4ort.xyz Knowledge Graph, 4ort.xyz, 10 Apr. 2026, https://4ort.xyz/entity/contra-costa-county.
BibTeX @misc{4ortxyz_contra-costa-county_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{Contra Costa County}}, year = {2026}, url = {https://4ort.xyz/entity/contra-costa-county}, note = {Accessed: 2026-04-10}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): Contra Costa County — https://4ort.xyz/entity/contra-costa-county (retrieved 2026-04-10)

Canonical URL: https://4ort.xyz/entity/contra-costa-county · Last refreshed:

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. 17d ago · Theklan · 2026-09-04 view diff on Wikidata ↗
    P14687 → Data:US presidential elections by county/Contra Costa County
    "/* wbsetclaim-create:2||1 */ [[Property:P14687]]: Data:US presidential elections by county/Contra Costa County, California.tab, Link US presidential election dataset (P14687, subject: United States pr"
  2. 5w ago · RVA2869 · 2026-08-12 view diff on Wikidata ↗
    Contains the administrative territorial entity → Martinez, Concord, Richmond
    Located in time zone → —
    "/* wbeditentity-update:0| */ QuickStatements 3.0 [[:toollabs:qs-dev/batch/46950|batch #46950]]: redundant value, already present at higher administrative level"
  3. 14w ago · Kleeblatt187 · 2026-06-12 view diff on Wikidata ↗
    Contains the administrative territorial entity → Martinez, Concord, Richmond
    "/* wbsetclaim-create:2||1 */ [[Property:P150]]: [[Q490441]]"
  4. 18w ago · Mahir256 · 2026-05-13 view diff on Wikidata ↗
    Category for people born here → Category:Births in Contra Costa County, California
    Local thumb → —
    Topic's main category → Category:Contra Costa County, California
    Water as percent of area → {'amount': '+10.93'}
    + 40 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.