Mount Vernon Flag

Mount Vernon

County Seat:
Yes
Area (mi²):
14.649
State:
Illinois

Mount Vernon is a city located in Jefferson County, Illinois. Mount Vernon has a 2026 population of 14,162. It is also the county seat of Jefferson County. Mount Vernon is currently declining at a rate of -0.7% annually and its population has decreased by -2.8% since the most recent census, which recorded a population of 14,570 in 2020.

14.2K
Total Population
967
Density (mi²)
-100 -0.7%
Growth

Nearby Cities

Sources

  1. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  3. American Community Survey (2009 - 2013)
  4. Census QuickFacts
  5. Historical Populations of States and Counties (1790 - 1990)