Mount Vernon is a town located in the U.S. state of Arkansas. It is within Faulkner County included in the Little Rock–North Little Rock–Conway Metropolitan Statistical Area. It has a total area of 1.01 square miles at 35°13′30″N 92°7′29″W. The elevation is 433 feet above sea level. As of the 2010 census data, it had a total population of 145. The population density was 144.55/sq mi. Estimated per capita income in 2015 was $18,357. It has Zip code 72111.