Napa County is a county north of San Pablo Bay located in the northern portion of the U.S. state of California. As of the 2020 United States census, the population was 138,019. The county seat is the City of Napa. Napa County was one of the original counties of California, created in 1850 at the time of statehood. Parts of the county's territory were given to Lak…Napa County is a county north of San Pablo Bay located in the northern portion of the U.S. state of California. As of the 2020 United States census, the population was 138,019. The county seat is the City of Napa. Napa County was one of the original counties of California, created in 1850 at the time of statehood. Parts of the county's territory were given to Lake County in 1861.
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