Mount Vernon, AL has a population of 1,329 and is the 13,422nd largest city in the United States. The population density is 242 per sq mi which is 164% higher than the Alabama average and 168% higher than the national average. The median age in Mount Vernon is 44 which is approximately 13% higher than the Alabama average of 39. In Mount Vernon, 50% of the population over 15 years of age are married, 99% speak English and 0% speak Spanish. 81% of Mount Vernon residents were born in Alabama, 18% were born out of state, 0% were born outside of the United States and 1% were foreign born.