Farmington is a city in Davis County, Utah, United States. It is part of the OgdenClearfield, Utah Metropolitan Statistical Area. The population was 18,255 at the 2010 census. It is the county seat of Davis County. Lagoon Amusement Park is located in Farmington. The city has made it onto the Money magazine’s "Best Places to Live" index, and was ranked number 12 on the 2011 list.