Vallejo–Fairfield metropolitan area
E268213
The Vallejo–Fairfield metropolitan area is a Northern California metro region centered on the cities of Vallejo and Fairfield in Solano County, forming part of the broader San Francisco Bay Area.
All labels observed (4)
| Label | Occurrences |
|---|---|
| Vallejo–Fairfield metropolitan area canonical | 2 |
| Fairfield–Vacaville urban area | 1 |
| San Francisco–Oakland–Berkeley, CA Metropolitan Statistical Area | 1 |
| Vallejo–Fairfield MSA | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T1878213 — 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: Vallejo–Fairfield metropolitan area Context triple: [Fairfield, California, isPartOfMetropolitanArea, Vallejo–Fairfield metropolitan area]
-
A.
Sacramento metropolitan area
The Sacramento metropolitan area is a major urban region in Northern California centered on the state capital of Sacramento, encompassing surrounding suburban and rural counties.
-
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.
East Bay
East Bay is a region of the San Francisco Bay Area in Northern California, encompassing cities such as Oakland and Berkeley along the eastern shore of the bay.
-
D.
East Bay
East Bay is a coastal inlet and estuarine body of water in northwest Florida that forms part of the larger Pensacola Bay system.
-
E.
Santa Clara Valley
Santa Clara Valley is a region in Northern California that encompasses much of Silicon Valley, known for its high-tech industry, suburban communities, and proximity to the San Francisco Bay Area.
- 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: Vallejo–Fairfield metropolitan area Target entity description: The Vallejo–Fairfield metropolitan area is a Northern California metro region centered on the cities of Vallejo and Fairfield in Solano County, forming part of the broader San Francisco Bay Area.
-
A.
Sacramento metropolitan area
The Sacramento metropolitan area is a major urban region in Northern California centered on the state capital of Sacramento, encompassing surrounding suburban and rural counties.
-
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.
East Bay
East Bay is a region of the San Francisco Bay Area in Northern California, encompassing cities such as Oakland and Berkeley along the eastern shore of the bay.
-
D.
East Bay
East Bay is a coastal inlet and estuarine body of water in northwest Florida that forms part of the larger Pensacola Bay system.
-
E.
Santa Clara Valley
Santa Clara Valley is a region in Northern California that encompasses much of Silicon Valley, known for its high-tech industry, suburban communities, and proximity to the San Francisco Bay Area.
- F. None of above. chosen
Statements (28)
| Predicate | Object |
|---|---|
| instanceOf |
metropolitan area
ⓘ
metropolitan statistical area ⓘ |
| abbreviation |
Vallejo–Fairfield metropolitan area
self-linksurface differs
ⓘ
surface form:
Vallejo–Fairfield MSA
|
| administrativeUnit |
Solano County
ⓘ
surface form:
Solano County, California
|
| centeredOn |
Fairfield, California
ⓘ
Vallejo ⓘ
surface form:
Vallejo, California
|
| contains |
City of Benicia, California
ⓘ
surface form:
Benicia, California
Dixon, California ⓘ Fairfield, California ⓘ Rio Vista, California ⓘ Suisun City, California ⓘ Vacaville, California ⓘ Vallejo ⓘ
surface form:
Vallejo, California
|
| country |
United States of America
ⓘ
surface form:
United States
|
| countySeatOf |
Solano County
ⓘ
surface form:
Solano County, California
|
| locatedIn |
California, United States
ⓘ
surface form:
California
Northern California ⓘ Solano County ⓘ
surface form:
Solano County, California
|
| namedAfter |
Fairfield, California
ⓘ
Vallejo ⓘ
surface form:
Vallejo, California
|
| observesDaylightSavingTime | yes ⓘ |
| partOf |
San Francisco Bay Area
ⓘ
San Francisco Bay Area ⓘ
surface form:
San Francisco–Oakland–San Jose combined statistical area
|
| principalCity |
Fairfield, California
ⓘ
Vallejo ⓘ
surface form:
Vallejo, California
|
| regionType | metropolitan statistical area defined by the United States Office of Management and Budget ⓘ |
| state |
California, United States
ⓘ
surface form:
California
|
| timeZone | Pacific Time Zone ⓘ |
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: Vallejo–Fairfield metropolitan area Description of subject: The Vallejo–Fairfield metropolitan area is a Northern California metro region centered on the cities of Vallejo and Fairfield in Solano County, forming part of the broader San Francisco Bay Area.
Referenced by (5)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
Fairfield, California
subject surface form:
Cordelia, California
this entity surface form:
Fairfield–Vacaville urban area
subject surface form:
Green Valley, Solano County, California
this entity surface form:
San Francisco–Oakland–Berkeley, CA Metropolitan Statistical Area
Vallejo–Fairfield metropolitan area
→
abbreviation
→
Vallejo–Fairfield metropolitan area
self-linksurface differs
ⓘ
this entity surface form:
Vallejo–Fairfield MSA