Mount Vernon, Illinois

Mount Vernon, Illinois
Town Center of Mount Vernon
Nicknames: 
The King City, The Festival City
Motto: 
Mount Vernon, City of Opportunity
Interactive map of Mount Vernon, Illinois
Mount Vernon
Mount Vernon
Coordinates: 38°19′08″N 88°53′12″W / 38.31889°N 88.88667°W / 38.31889; -88.88667
CountryUnited States
StateIllinois
CountyJefferson
TownshipsMount Vernon, Shiloh, Dodds, McClellan
Founded1817
Area
 • Total
14.66 sq mi (37.97 km2)
 • Land14.58 sq mi (37.77 km2)
 • Water0.081 sq mi (0.21 km2)
Elevation
518 ft (158 m)
Population
 (2020)
 • Total
14,600
 • Density1,001.2/sq mi (386.56/km2)
Time zoneUTC−6 (CST)
 • Summer (DST)UTC−5 (CDT)
ZIP code
62864
Area codes618
FIPS code17-51180
GNIS feature ID2395129
WebsiteOfficial website

Mount Vernon is a city in Jefferson County, Illinois, United States, and its county seat. The population was 14,600 at the 2020 census. Mount Vernon is the principal city of the Mount Vernon, Illinois micropolitan area, which includes all of Jefferson and Hamilton counties.