Fairmont, MN Map Directions MapQuest
Fairmont Map. Fairmont is a city in Martin County, Minnesota, United population was 10,666 at the 2010 census. It is the county seat of Martin County. According to the United States Census Bureau, the city has a total area of square miles ( km²), of which, square miles ( km²) of it is land and square miles ( km²) of it (%) is water.