Cities, Towns, and Villages in St. Clair County, Illinois

Here is a list of all the cities, towns, and villages in St. Clair County, Illinois

St. Clair County is the ninth-most populous county in Illinois. Located directly east of St. Louis, the county is part of the Metro East region of the Greater St. Louis metropolitan area in southern Illinois.

Here is a list of all the cities, towns, and villages in St. Clair County, Illinois:

Cities in St. Clair County, Illinois

  • Belleville
  • Cahokia Heights
  • Collinsville
  • Columbia
  • East St. Louis
  • Fairview Heights
  • Lebanon
  • Madison
  • Mascoutah
  • O’Fallon


  • Canteen
  • Caseyville
  • Centreville
  • East St. Louis
  • Engelmann
  • Fayetteville
  • Freeburg
  • Lebanon
  • Lenzburg
  • Marissa
  • Mascoutah
  • Millstadt
  • New Athens
  • O’Fallon
  • Prairie du Long
  • St. Clair
  • Shiloh Valley
  • Smithton
  • Stites
  • Stookey
  • Sugarloaf

Villages in St. Clair County, Illinois

  • Brooklyn
  • Caseyville
  • Dupo
  • East Carondelet
  • Fairmont City
  • Fayetteville
  • Freeburg
  • Hecker
  • Lenzburg
  • Marissa
  • Millstadt
  • New Athens
  • New Baden
  • Sauget
  • Shiloh
  • Smithton
  • St. Libory
  • Summerfield
  • Swansea
  • Washington Park

Unincorporated communities

  • Douglas
  • Imbs
  • North Dupo
  • Signal Hill
  • State Park Place
  • Westview

Census-designated places

  • Darmstadt
  • Floraville
  • Paderborn
  • Rentchler
  • Scott AFB

Former Township

  • Belleville

Quick Facts about St. Clair County, Illinois

Here are some quick facts about St. Clair county, Illinois:

  • Location: St. Clair County is located in the southwestern part of Illinois.
  • County Seat: The county seat of St. Clair County is Belleville.
  • Population: 254,796
  • Metro-East Region: St. Clair County is part of the Metro-East region, an area in Illinois east of St. Louis, Missouri.
  • Transportation Hub: The county is a significant transportation hub with major highways, including Interstate 64 and Interstate 255, passing through it.
  • Scott Air Force Base: St. Clair County is home to Scott Air Force Base, a major U.S. Air Force installation with a significant impact on the local economy.
  • Economy: The economy of St. Clair County is diverse, with contributions from manufacturing, healthcare, education, and military activities.
  • Historic Sites: The county has historical sites, including Cahokia Mounds State Historic Site, which preserves the remnants of the most sophisticated prehistoric native civilization north of Mexico.
  • Cultural Institutions: Belleville, the county seat, is home to cultural institutions, including museums and theaters, contributing to the area’s cultural vibrancy.
  • Government: St. Clair County operates under a county board form of government.
  • Official website:

How large is St. Clair County Illinois?

  • St. Clair County / Area is 1,746 km²

How many counties are in Illinois?

  • There are 102 counties in Illinois. The number of counties has remained stable since the middle of the 19th century.

Which of the 50 states is Illinois?

  • Illinois became the 21st state on December 3, 1818. Illinois had two capital cities, Kaskaskia, 1818, and Vandalia, 1820, before Springfield became the permanent capital city in 1837.

What is the newest county in Illinois?

  • Ford County was formed February 17, 1859 making it Illinois’s “newest” county. It was created at the behest of some residents of Vermilion County, who complained to the General Assembly that they lived too far from the county seat. Ford County was named after Thomas Ford, the Governor of Illinois from 1842 to 1846.
St. Clair County, Illinois map
St. Clair County, Illinois map

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