Fairmont is a city located in Marion County, West Virginia. With a 2020 population of 18,349, it is the 6th largest city in West Virginia and the 1977th largest city in the United States. Fairmont is currently declining at a rate of -0.17% annually and its population has decreased by -1.90% since the most recent census, which recorded a population of 18,704 in 2010. Fairmont reached it's highest population of 29,346 in 1950. Spanning over 9 miles, Fairmont has a population density of 2,136 people per square mile.
The average household income in Fairmont is $55,546 with a poverty rate of 24.63%. The median rental costs in recent years comes to $719 per month, and the median house value is $108,900. The median age in Fairmont is 34.3 years, 33.3 years for males, and 36.6 years for females. For every 100 females there are 94.5 males.