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* County Seat: Auburn
* Incorporated: April 25, 1851
* Named for: Placer Creek, a tributary of the American River, where gold was first discovered in California
* Population: 398,336 (2019)
* Area: 1,440 square miles
* Median household income: $93,020 (2019)
* Major industries: Agriculture, tourism, and mining
Interesting facts about Placer County
* Placer County is home to the Foresthill Divide, a region known for its gold mining history.
* The county is also home to several ski resorts, including Sugar Bowl, Squaw Valley Alpine Meadows, and Tahoe Donner.
* Placer County is located at the base of the Sierra Nevada Mountains and is known for its beautiful scenery.
* The county is home to several lakes and reservoirs, including Lake Tahoe, Folsom Lake, and Rollins Reservoir.
* Placer County is also home to several historical landmarks, including the Auburn State Recreation Area, the Gold Country Museum, and the Leland Stanford Mansion.