Communities in St. Clair County Illinois

Historic Cahokia Courthouse

St. Clair County Illinois is located east of Downtown St. Louis with the Mississippi River being the western boundary of the county. Madison County is to the north and Monroe County is to the south. St. Clair County was founded in 1790 when it was then part of the Northwest Territory. Later in 1809, it was the one of the two original counties to be formed in the Illinois Territory. At that time, it covered the northern three-fourths of the what is the state of Illinois today. The area that St. Clair covers today, is 674 square miles. The county seat is located in Belleville Illinois and the 2010 US Census put the population at 270,056.

Below is a list of the larger communities that are found in St. Clair County. Click on any of the links to find that community's specific government information such as the address to the city hall, phone numbers of the mayor, city clerk, police department and other information.

Belleville Illinois
Belleville Illinois - Belleville Illinois is a large city in St. Clair County with over 44,000 residents. The community lies within four zip codes, 62220, 62221, 62223 and 62226. - More Info Tags: 62220, 62221, 62223, 62226, Belleville Illinois
Cahokia Illinois
Cahokia Illinois - Cahokia Illinois is located in eastern St. Clair County in the 62206 zip code. Cahokia is home to several historic French Creole landmarks that are on the National Register of Historic Places. - More Info Tags: 62206, Cahokia Illinois
Dupo Illinois
Dupo Illinois - The Village of Dupo Illinois is located in St. Clair County in the 62239 zip code and lies west of the Route 3 and Interstate 255 merger in the area known as the American Bottoms. - More Info Tags: 62239, Dupo Illinois
East St Louis Illinois
East St Louis Illinois - The City of East St Louis Illinois is located in St Clair County and is situated along the east bank of the Mississippi River, directly across from Downtown St. Louis. - More Info Tags: 62201, East St Louis Illinois
Fairview Heights Illinois
Fairview Heights Illinois - The City of Fairview Heights Illinois is located in St. Clair County. The area is known for the St. Clair Shopping Mall. - More Info Tags: 62208, Fairview Heights Illinois
Freeburg Illinois
Freeburg Illinois - The Village of Freeburg Illinois is located in St Clair County and is about 30 minutes southeast of Downtown St Louis in the 62243 zip code. - More Info Tags: 62243, Freeburg Illinois
Lebanon Illinois
Lebanon Illinois - The City of Lebanon Illinois is located in St Clair County, just about 30 minutes east of Downtown St Louis in the 62254 zip code. - More Info Tags: 62254, Lebanon
Mascoutah Illinois
Mascoutah Illinois - The City of Mascoutah Illinois, home of Mid America Airport, is located in St. Clair County. - More Info Tags: 62258, Mascoutah Illinois
Millstadt Illinois
Millstadt Illinois - The Village of Millstadt Illinois is located in St Clair County and is about 35 minutes southeast of Downtown St Louis. Millstadt is home to one of the three Eckert's Farm locations. - More Info Tags: 62260, Millstadt Illinois
New Athens Illinois
New Athens Illinois - The Village of New Athens Illinois is located in St Clair County along the east bank of the Kaskaskia River. - More Info Tags: 62264, New Athens Illinois
O'Fallon Illinois
O'Fallon Illinois - The City of OFallon Illinois is located in St Clair County in the 62269 zip code. Rock Spring Park and the OFallon Family Sports Park is found in this community. - More Info Tags: 62269, O'Fallon Illinois
Scott Air Force Base Illinois
Scott Air Force Base Illinois - Scott Air Force Base, an active United States military installation, is located in St Clair County in the 62225 zip code, about 35 minutes east of Downtown St Louis via Interstate 64. - More Info Tags: 62225, Scott Air Force Base Illinois
Shiloh Illinois
Shiloh Illinois - The Village of Shiloh Illinois is located in St Clair County in the 62221 and the 62269 zip codes. - More Info Tags: 62221, 62269, Shiloh Illinois
Swansea Illinois
Swansea Illinois - The Village of Swansea is located in St Clair County Illinois, less than 20 minutes east of Downtown St Louis, in the 62226 zip code. - More Info Tags:

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