Fairfield is a city in and the county seat of Solano County, California, United States, in the North Bay sub-region of the San Francisco Bay Area. The city has a diversified economy, with government, manufacturing, healthcare, retail, professional and commercial construction sectors. Fairfield was founded in 1856 by clipper ship captain Robert H. Waterman, and named after his former hometown of Fairfield, Connecticut. It is the location of Travis Air Force Base and the headquarters of Jelly Belly. The population was 119,881 at the 2020 census.