Fairmont is a city in Marion County, West Virginia, United States. Nicknamed "The Friendly City". The population was 19,097 at the 2000 census. It is the county seat of Marion County.
Fairmont is located at 39°28′53″N 80°8′36″W / 39.48139°N 80.14333°W / 39.48139; -80.14333 (39.481253, -80.143453). The Tygart Valley River and the West Fork River join in Fairmont to form the Monongahela River.
According to the United States Census Bureau, the city has a total area of 8.2 square miles (21.2 km2), of which, 7.8 square miles (20.3 km2) of it is land and 0.4 square miles (0.9 km2) of it (4.40%) is water.