Jacksonville Flag

Jacksonville

County:
Morgan County
County Seat:
Yes
Area (mi²):
10.563
State:
Illinois

Jacksonville is a city located in Morgan County, Illinois. Jacksonville has a 2026 population of 17,801. It is also the county seat of Morgan County. Jacksonville is currently declining at a rate of -0.47% annually and its population has decreased by -2.43% since the most recent census, which recorded a population of 18,245 in 2020.

17.8K
Total Population
1,685
Density (mi²)
-84 -0.47%
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)