farmington is in what county
Farmington is a census-designated place (CDP) in San Joaquin County, California, United States. The population was 207 at the 2010 census, down from 262 at the 2000 census. Farmington is located at 37Â°55â²47â³N 120Â°59â²58â³W / 37.92972Â°N 120.99944Â°W / 37.92972; -120.99944 (37.929625, -120.999574). According to the United States Census Bureau, the CDP has a total area of 2.5 square miles (6.6 kmÂ²), all of it land.