Mount Vernon is a city located in Posey County Indiana. It is also the county seat of Posey County. With a 2020 population of 6,376, it is the 103rd largest city in Indiana and the 4174th largest city in the United States . Mount Vernon is currently declining at a rate of -0.98% annually and its population has decreased by -4.65% since the most recent census, which recorded a population of 6,687 in 2010. Mount Vernon reached it's highest population of 7,656 in 1980. Spanning over 3 miles, Mount Vernon has a population density of 2,216 people per square mile.
The average household income in Mount Vernon is $67,657 with a poverty rate of 17.45%. The median rental costs in recent years comes to $698 per month, and the median house value is $123,200. The median age in Mount Vernon is 40.4 years, 39.7 years for males, and 40.6 years for females.