Illiopolis Flag

Illiopolis

County:
Sangamon County
County Seat:
No
Area (mi²):
0.677
State:
Illinois

Illiopolis is a village located in Sangamon County, Illinois. Illiopolis has a 2026 population of 834. Illiopolis is currently declining at a rate of 0% annually and its population has decreased by -1.18% since the most recent census, which recorded a population of 844 in 2020.

834
Total Population
1,232
Density (mi²)

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)