Mount Vernon, Illinois

Mount Vernon population, 2020 to 2024

Mount Vernon lost 408 residents from July 2020 to July 2024, a change of -2.8%. In the latest year it moved by -100. Among 330 Illinois places of 5,000 or more, that growth ranks 275th; the median place changed by -0.9%. The median place of 5,000+ in Illinois has 14,760 people, so Mount Vernon is 96% of it.

Mount Vernon covers 14.66 square miles of land and 0.08 of water, for 966 people per square mile of land. The median Illinois place of 5,000+ has 2,177, so Mount Vernon is less dense than the typical town.

What county Mount Vernon is in

All of Mount Vernon's residents live in Jefferson County, which had 36,107 residents in 2024. Mount Vernon holds 39.2% of the county's population. The shaded shape is on the map above; dots mark the eight nearest places.

ZIP codes in Mount Vernon

1 ZIP Code Tabulation Area (ZCTA) overlaps Mount Vernon by at least 10% of the ZCTA's or the city's land: 62864. ZCTAs are Census approximations of USPS ZIP code delivery areas. The list comes from the 2020 ZCTA to place relationship file, so a city that annexed land after 2020 may reach into ZIP codes not listed here.

Where Mount Vernon is

The Census internal point of Mount Vernon is at 38.314200, -88.917500. Springfield, the capital, is 108.7 miles NNW in a straight line. The nearest larger place is Marion, IL (17,021 people), 40.1 miles away. The nearest city of 100,000 or more is St. Louis, MO, 75.1 miles away.

Daylight in Mount Vernon

At 38.31° N, Mount Vernon gets about 14 h 50 min of daylight around the June solstice and 9 h 30 min around the December solstice, a swing of 5 h 21 min. Figures are sunrise to sunset from the SunCalc model for June 21 and December 21, 2026.

Places near Mount Vernon

The eight nearest incorporated places of 1,000+ in Illinois, measured between internal points. The closest is Ina, 11.4 miles away, with 1,648 people.