Fairfield is a city in and the county seat of Solano County, California, in the North Bay sub-region of the San Francisco Bay Area. It is generally considered the midpoint between the cities of San Francisco and Sacramento, approximately 40 miles (64 km) from the city center of each city, approximately 40 miles (64 km) from the city center of Oakland, less than 19 miles (31 km) from Napa Valley, 16 miles (26 km) from the Carquinez Bridge, and 14 miles (23 km) from the Benicia Bridge. Fairfield was founded in 1856 by clippership captain Robert H. Waterman, and named after his former hometown of Fairfield, Connecticut.
It is the home of Travis Air Force Base and the headquarters of Jelly Belly. With a population of 119,881 at the 2020 census, it is slightly smaller in population than Vallejo. Other nearby cities include Suisun City, Vacaville, Rio Vista, Benicia, and Napa.