Placer County, California

County seat: Auburn · Population 442,081 (2025) · 1,407 sq mi

Placer County is the 20th most populous of California's 58 counties, with 442,081 people (2025 estimate). Its county seat is Auburn. The map shows its 6 cities and towns and the 8 neighboring counties.

Map of Placer County, California with cities, towns and the county boundary
Placer County, California with its cities and towns, unincorporated communities (CDPs) and neighboring counties. Boundaries: U.S. Census Bureau, 2025. Free to use with attribution (CC BY 4.0).
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Placer County facts

County seat
Auburn
Population (2025 estimate)
442,081 +9.2% since 2020
Land area
1,407 sq mi 32nd largest of 58
Water area
95 sq mi
Population density
314 per sq mi
Established
1851
Named after
placer mining technique of mining stream bed deposits for minerals
Largest city
Roseville 167,302
Median household income
$115,998
Cities and towns
6 plus 17 CDPs
ZIP codes
34
Time zone
Pacific
FIPS code
06061

Cities and towns in Placer County

Placer County has 6 incorporated cities, towns and villages. Populations count the people living inside Placer County; cities that cross a county line also list the other counties.

NameTypePopulation 2025Also in
RosevilleCity167,302
RocklinCity76,821
LincolnCity57,367
Auburn (county seat)City13,847
LoomisTown7,004
ColfaxCity2,043

Unincorporated communities (CDPs)

Census-designated places are communities without their own city government; the county provides their services.

CommunityPopulationAlso in
Granite Bay21,673
North Auburn13,480
Meadow Vista3,162
Kings Beach2,736
Sunnyside-Tahoe City1,599
Newcastle1,585
Foresthill1,483
Dollar Point1,477
Sheridan1,183
Penryn1,114
Cedar Flat1,089
Tahoe Vista1,048
Alta656
Carnelian Bay391
Tahoma225El Dorado County
Dutch Flat200
Kingvale0Nevada County

ZIP codes in Placer County

34 ZIP codes reach into Placer County. ZIP codes ignore county lines, so some also cover a neighboring county.

Population of Placer County, 2020–2025

Placer County grew by 37,314 people (+9.2%) between April 2020 and July 2025: 213 more deaths than births and a net gain of 37,715 people from migration.

Year (July 1)Population
2020405,971
2021413,038
2022418,469
2023425,195
2024434,279
2025442,081

Neighboring counties

Printable Placer County map

The PDF is a vector file with real text: it prints sharp on Letter paper and you can search it for a town. The PNG is 2400 pixels wide for slides and documents. Both are free to use with a credit to WhichCounty.

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Sources

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