Sierra County is the name of several counties in the United States:
Sierra County, California
Sierra County, New Mexico
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SierraCounty, population 3,555, is located in the heart of the northern section of the Sierra Nevada on Highway 49.
Green and heavily timbered, the western half of SierraCounty and the county seat of Downieville, Goodyears Bar, Pike and Alleghany hold memories of the Gold Rush era.
In spring and early summer, wildflowers are abundant in all areas of the county.