Contra Costa County
E17060
Contra Costa County is a populous county in the San Francisco Bay Area known for its suburban communities, regional parks, and role as a residential and industrial hub east of Oakland and San Francisco.
All labels observed (15)
How this entity was disambiguated
This entity first appeared as the object of triple T22112 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Contra Costa County Context triple: [Northern California, contains, Contra Costa County]
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A.
Alameda County
Alameda County is a populous and diverse county in the San Francisco Bay Area that includes cities such as Oakland and Berkeley.
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B.
Sacramento County
Sacramento County is a county in Northern California that includes the state capital, Sacramento, and serves as a major political and economic hub of the region.
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C.
Santa Clara County
Santa Clara County is a populous and economically significant county in California’s Silicon Valley, home to major technology companies and cities such as San Jose.
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D.
San Francisco County
San Francisco County is a densely populated, culturally diverse urban county on the tip of the San Francisco Peninsula, encompassing the city of San Francisco and serving as a major economic and technological hub in California.
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E.
San Mateo County, California
San Mateo County, California is a coastal county in the San Francisco Bay Area known for its affluent communities, tech industry presence, and proximity to both San Francisco and Silicon Valley.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Contra Costa County Target entity description: Contra Costa County is a populous county in the San Francisco Bay Area known for its suburban communities, regional parks, and role as a residential and industrial hub east of Oakland and San Francisco.
-
A.
Alameda County
Alameda County is a populous and diverse county in the San Francisco Bay Area that includes cities such as Oakland and Berkeley.
-
B.
Sacramento County
Sacramento County is a county in Northern California that includes the state capital, Sacramento, and serves as a major political and economic hub of the region.
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C.
Santa Clara County
Santa Clara County is a populous and economically significant county in California’s Silicon Valley, home to major technology companies and cities such as San Jose.
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D.
San Francisco County
San Francisco County is a densely populated, culturally diverse urban county on the tip of the San Francisco Peninsula, encompassing the city of San Francisco and serving as a major economic and technological hub in California.
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E.
San Mateo County, California
San Mateo County, California is a coastal county in the San Francisco Bay Area known for its affluent communities, tech industry presence, and proximity to both San Francisco and Silicon Valley.
- F. None of above. chosen
Statements (93)
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Contra Costa County Description of subject: Contra Costa County is a populous county in the San Francisco Bay Area known for its suburban communities, regional parks, and role as a residential and industrial hub east of Oakland and San Francisco.
Referenced by (623)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Contra Costa County
linked to: Contra Costa County
linked to: Contra Costa County
linked to: Contra Costa County
subject linked to:
District 4
linked to: Contra Costa County
Superior Court of California, County of Contra Costa
→
jurisdiction
→
Contra Costa County, California
ⓘ
linked to: Contra Costa County
Superior Court of California, County of Contra Costa
→
geographicLocation
→
Contra Costa County, California
ⓘ
linked to: Contra Costa County
subject linked to:
Concord, California, United States
linked to: Contra Costa County
linked to: Contra Costa County
linked to: Contra Costa County
linked to: Contra Costa County
linked to: Contra Costa County
linked to: Contra Costa County
linked to: Contra Costa County
linked to: Contra Costa County
linked to: Contra Costa County
linked to: Contra Costa County
linked to: Contra Costa County
subject linked to:
Lafayette, California, United States