Fairfield, California is 9.4% larger than Vallejo, California.
Area: 98 km2 calculated
Fairfield is a city in, and the county seat of, Solano County, California, United States. Wikipedia
Area: 89 km2 calculated
Vallejo is the largest city in Solano County, California, United States. The population was 115,942 at the 2010 census. It is the tenth most populous city in the San Francisco Bay Area, and is located on the northeastern shore of San Pablo Bay. Vallejo is named for General Mariano Guadalupe Vallejo. Wikipedia