Columbia, Illinois

Columbia is a city mainly in Monroe County with a small portion in St. Clair County in the U.S. state of Illinois, about 12 miles (19 km) south of St. Louis, Missouri. The population was 10,999 at the 2020 census.

Columbia
City
Downtown Columbia
Motto(s): 
Good for business, good for life
Location of Columbia in Monroe County, Illinois.
Location of Illinois in the United States
Coordinates: 38°26′57″N 90°12′31″W
Country United States
State Illinois
CountySt. Clair and Monroe
Founded1859
Government
  MayorBob Hill
Area
  Total10.38 sq mi (26.88 km2)
  Land10.32 sq mi (26.74 km2)
  Water0.06 sq mi (0.14 km2)
Elevation
453 ft (138 m)
Population
 (2020)
  Total10,999
  Density1,065.48/sq mi (411.37/km2)
Time zoneUTC−6 (CST)
  Summer (DST)UTC−5 (CDT)
ZIP Code(s)
62236
Area code618
FIPS code17-15833
GNIS feature ID2393604
Wikimedia CommonsColumbia, Illinois
Websitewww.columbiaillinois.com
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