San Mateo County, California
E10525
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.
All labels observed (15)
How this entity was disambiguated
This entity first appeared as the object of triple T14484 — 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: San Mateo County, California Context triple: [Atherton, California, United States, locatedIn, San Mateo County, California]
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A.
Tulare County, California
Tulare County, California is a largely rural county in the southern Sierra Nevada region known for its vast agricultural output and proximity to Sequoia National Park and Mount Whitney.
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B.
San Francisco Bay Area
The San Francisco Bay Area is a major metropolitan region in Northern California known for its technology industry, cultural diversity, and iconic landmarks such as the Golden Gate Bridge.
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C.
Tuolumne County
Tuolumne County is a rural county in the Sierra Nevada region of California known for its mountainous landscapes, outdoor recreation, and inclusion of part of Yosemite National Park.
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D.
San Jose
San Jose is a major technology and innovation hub in Silicon Valley and one of the largest cities in Northern California.
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E.
Multnomah County
Multnomah County is an Oregon county in the United States that encompasses Portland, the state’s largest city and economic hub.
- 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: San Mateo County, California Target entity description: 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.
-
A.
Tulare County, California
Tulare County, California is a largely rural county in the southern Sierra Nevada region known for its vast agricultural output and proximity to Sequoia National Park and Mount Whitney.
-
B.
San Francisco Bay Area
The San Francisco Bay Area is a major metropolitan region in Northern California known for its technology industry, cultural diversity, and iconic landmarks such as the Golden Gate Bridge.
-
C.
Tuolumne County
Tuolumne County is a rural county in the Sierra Nevada region of California known for its mountainous landscapes, outdoor recreation, and inclusion of part of Yosemite National Park.
-
D.
San Jose
San Jose is a major technology and innovation hub in Silicon Valley and one of the largest cities in Northern California.
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E.
Multnomah County
Multnomah County is an Oregon county in the United States that encompasses Portland, the state’s largest city and economic hub.
- F. None of above. chosen
Statements (73)
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: San Mateo County, California Description of subject: 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.
Referenced by (473)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
San Mateo County
Board of Directors of the San Mateo County Transit District
→
appliesToJurisdiction
→
San Mateo County, California
ⓘ
Board of Directors of the San Mateo County Transit District
→
locatedInTheAdministrativeTerritorialEntity
→
San Mateo County, California
ⓘ
Board of Directors of the San Mateo County Transit District
→
meetsIn
→
San Mateo County, California
ⓘ
Board of Directors of the San Mateo County Transit District
→
serviceArea
→
San Mateo County, California
ⓘ
this entity surface form:
San Mateo County
this entity surface form:
San Mateo County
this entity surface form:
San Mateo County
subject surface form:
District 4 (Caltrans)
this entity surface form:
San Mateo County
this entity surface form:
San Mateo County
this entity surface form:
San Mateo County
this entity surface form:
San Mateo County
this entity surface form:
County of San Mateo
this entity surface form:
County of San Mateo
this entity surface form:
San Mateo County
this entity surface form:
San Mateo County
subject surface form:
Belmont, California
this entity surface form:
San Mateo County
this entity surface form:
San Mateo County
this entity surface form:
San Mateo County
this entity surface form:
San Mateo County
this entity surface form:
County of San Mateo
this entity surface form:
San Mateo County
this entity surface form:
San Mateo County
this entity surface form:
San Mateo County
this entity surface form:
San Mateo County
this entity surface form:
Government of San Mateo County, California
this entity surface form:
San Mateo County
this entity surface form:
San Mateo County Government