East Contra Costa County
E1409974
UNEXPLORED
East Contra Costa County is a subregion of Contra Costa County in the eastern San Francisco Bay Area, known for its rapidly growing suburban communities and proximity to the Sacramento–San Joaquin River Delta.
All labels observed (3)
| Label | Occurrences |
|---|---|
| East Contra Costa County canonical | 4 |
| Eastern Contra Costa County | 1 |
| Lamorinda area of Contra Costa County, California | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T19877641 — 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: East Contra Costa County Context triple: [Oakley, California, partOf, East Contra Costa County]
-
A.
West Contra Costa County
West Contra Costa County is a subregion of Contra Costa County in the San Francisco Bay Area, encompassing several urban and suburban communities along the county’s western, bayside corridor.
-
B.
Contra Costa County
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.
-
C.
Alameda County
Alameda County is a populous and diverse county in the San Francisco Bay Area that includes cities such as Oakland and Berkeley.
-
D.
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.
-
E.
Contra Costa County and Solano County
Contra Costa County and Solano County are neighboring counties in the northern San Francisco Bay Area of California, situated on opposite sides of the Carquinez Strait.
- 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: East Contra Costa County Target entity description: East Contra Costa County is a subregion of Contra Costa County in the eastern San Francisco Bay Area, known for its rapidly growing suburban communities and proximity to the Sacramento–San Joaquin River Delta.
-
A.
West Contra Costa County
West Contra Costa County is a subregion of Contra Costa County in the San Francisco Bay Area, encompassing several urban and suburban communities along the county’s western, bayside corridor.
-
B.
Contra Costa County
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.
-
C.
Alameda County
Alameda County is a populous and diverse county in the San Francisco Bay Area that includes cities such as Oakland and Berkeley.
-
D.
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.
-
E.
Contra Costa County and Solano County
Contra Costa County and Solano County are neighboring counties in the northern San Francisco Bay Area of California, situated on opposite sides of the Carquinez Strait.
- F. None of above. chosen
Referenced by (6)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: East Contra Costa County
subject linked to:
Pittsburg Center BART station
linked to: East Contra Costa County