Placer County

E18391

county county of California

Placer County is a county in Northern California that stretches from the suburbs of the Sacramento metropolitan area into the Sierra Nevada, including parts of Lake Tahoe.

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All labels observed (4)

Label	Occurrences
Placer County, California	92
Placer County canonical	41
County of Placer	3
Placer County (former)	1

How this entity was disambiguated

This entity first appeared as the object of triple T22115 — 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: Placer County
Context triple: [Northern California, contains, Placer County]

A. Humboldt County
Humboldt County is a rural coastal county in far Northern California known for its redwood forests, rugged Pacific shoreline, and strong cannabis-growing culture.
B. 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.
C. 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.
D. Mendocino County
Mendocino County is a coastal county in Northern California known for its rugged Pacific shoreline, redwood forests, and wine-producing Anderson Valley.
E. Mariposa County
Mariposa County is a rural county in central California best known as the gateway to much of Yosemite National Park and the Sierra Nevada.
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: Placer County
Target entity description: Placer County is a county in Northern California that stretches from the suburbs of the Sacramento metropolitan area into the Sierra Nevada, including parts of Lake Tahoe.

A. Humboldt County
Humboldt County is a rural coastal county in far Northern California known for its redwood forests, rugged Pacific shoreline, and strong cannabis-growing culture.
B. 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.
C. 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.
D. Mendocino County
Mendocino County is a coastal county in Northern California known for its rugged Pacific shoreline, redwood forests, and wine-producing Anderson Valley.
E. Mariposa County
Mariposa County is a rural county in central California best known as the gateway to much of Yosemite National Park and the Sierra Nevada.
F. None of above. chosen

Statements (49)

Predicate	Object
instanceOf	county ⓘ county of California ⓘ
borders	El Dorado County ⓘ Nevada County, California ⓘ surface form: Nevada County Sacramento County ⓘ Sutter County ⓘ Washoe County ⓘ surface form: Washoe County, Nevada Yuba County ⓘ
climate	Mediterranean in lowlands ⓘ alpine in high Sierra Nevada areas ⓘ
contains	Auburn State Recreation Area ⓘ Auburn, California ⓘ Colfax, California ⓘ Donner Pass ⓘ surface form: Donner Pass vicinity (western approaches) Folsom Lake (northern and eastern shores) ⓘ Granite Bay, California ⓘ Kings Beach ⓘ surface form: Kings Beach, California City of Lincoln, California ⓘ surface form: Lincoln, California Town of Loomis, California ⓘ surface form: Loomis, California Tahoe Vista ⓘ surface form: North Lake Tahoe (California side) City of Rocklin, California ⓘ surface form: Rocklin, California Roseville, California ⓘ Squaw Valley ⓘ surface form: Squaw Valley (Olympic Valley), California Tahoe City ⓘ surface form: Tahoe City, California part of Lake Tahoe ⓘ part of the Sierra Nevada ⓘ
country	United States of America ⓘ surface form: United States
elevationRange	from Sacramento Valley lowlands to high Sierra Nevada mountains ⓘ
establishedIn	1851 ⓘ
governmentType	county government ⓘ
hasHighway	California State Route 49 ⓘ California State Route 65 ⓘ Interstate 80 ⓘ Old U.S. Route 40 ⓘ surface form: U.S. Route 40 (historic)
hasIndustry	outdoor recreation ⓘ retail ⓘ technology ⓘ tourism ⓘ
largestCity	Roseville, California ⓘ
locatedIn	California, United States ⓘ surface form: California Northern California ⓘ
namedFor	placer mining ⓘ
partOf	Sacramento metropolitan area ⓘ surface form: Greater Sacramento region Sacramento metropolitan area ⓘ
region	Sacramento Valley ⓘ Sierra Nevada ⓘ
seat	Auburn, California ⓘ
state	California, United States ⓘ surface form: California
timeZone	Pacific Time Zone ⓘ

How these facts were elicited

Referenced by (137)

Full triples — surface form annotated when it differs from this entity's canonical label.

Placer County Supervisorial District 5 → county → Placer County ⓘ

Colfax Elementary School District → county → Placer County ⓘ

Colfax Elementary School District → locatedIn → Placer County ⓘ