Fairfield is a city in, and the county seat of, Solano County, California, United States. It is generally considered the midpoint between the cities of San Francisco and Sacramento, approximately 36 miles (58 km) from the city center of both cities, approximately 31 miles (50 km) from the city center of Oakland, less than 19 miles (31 km) from Napa Valley, 16 miles from the Carquinez Bridge, and 14 miles from the Benicia Bridge. It is located in the North-eastern part of the Bay Area. Fairfield was founded in 1856 by clippership captain Robert H.