Castro Valley, California
E265559
Castro Valley, California is a suburban unincorporated community in Alameda County known for its residential neighborhoods, proximity to the East Bay hills, and access to regional parks and commuting routes.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Castro Valley, California canonical | 12 |
| Castro Valley Forum | 1 |
| Castro Valley, California, United States | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T2345506 — 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: Castro Valley, California Context triple: [East Bay, contains, Castro Valley, California]
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A.
El Sobrante, California
El Sobrante, California is an unincorporated suburban community in the San Francisco Bay Area known for its residential neighborhoods and proximity to Richmond and other East Bay cities.
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B.
San Carlos, California
San Carlos, California is a small city on the San Francisco Peninsula known for its suburban charm, vibrant downtown, and role as a local transportation and business hub.
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C.
Martinez, California
Martinez, California is a historic waterfront city in the San Francisco Bay Area known as the county seat of Contra Costa County and for its role as a regional rail and transportation hub.
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D.
Fair Oaks, California
Fair Oaks, California is a suburban community in Sacramento County known for its semi-rural feel, oak tree–lined neighborhoods, and proximity to the American River.
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E.
Gonzales, California
Gonzales, California is a small agricultural city in California’s Salinas Valley, known for its significant role in lettuce and vegetable production.
- 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: Castro Valley, California Target entity description: Castro Valley, California is a suburban unincorporated community in Alameda County known for its residential neighborhoods, proximity to the East Bay hills, and access to regional parks and commuting routes.
-
A.
El Sobrante, California
El Sobrante, California is an unincorporated suburban community in the San Francisco Bay Area known for its residential neighborhoods and proximity to Richmond and other East Bay cities.
-
B.
San Carlos, California
San Carlos, California is a small city on the San Francisco Peninsula known for its suburban charm, vibrant downtown, and role as a local transportation and business hub.
-
C.
Martinez, California
Martinez, California is a historic waterfront city in the San Francisco Bay Area known as the county seat of Contra Costa County and for its role as a regional rail and transportation hub.
-
D.
Fair Oaks, California
Fair Oaks, California is a suburban community in Sacramento County known for its semi-rural feel, oak tree–lined neighborhoods, and proximity to the American River.
-
E.
Gonzales, California
Gonzales, California is a small agricultural city in California’s Salinas Valley, known for its significant role in lettuce and vegetable production.
- F. None of above. chosen
Statements (47)
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: Castro Valley, California Description of subject: Castro Valley, California is a suburban unincorporated community in Alameda County known for its residential neighborhoods, proximity to the East Bay hills, and access to regional parks and commuting routes.
Referenced by (14)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
Dublin, California
subject surface form:
Ashland, California
subject surface form:
Ashland, California
subject surface form:
Fairview, California
this entity surface form:
Castro Valley, California, United States
Castro Valley, California
→
hasLocalNewspaper
→
Castro Valley, California
self-linksurface differs
ⓘ
this entity surface form:
Castro Valley Forum