Mount Vernon, IN has a population of 6,579 and is the 5,408th largest city in the United States. The population density is 2,326 per sq mi which is 1196% higher than the Indiana average and 2468% higher than the national average. The median age in Mount Vernon is 41 which is approximately 9% higher than the Indiana average of 37. In Mount Vernon, 57% of the population over 15 years of age are married, 99% speak English and 0% speak Spanish. 74% of Mount Vernon residents were born in Indiana, 25% were born out of state, 0% were born outside of the United States and 1% were foreign born.