Cities and Towns in Saint Clair County, Illinois
Founded in 1790, St. Clair County is one of 102 counties in the state of Illinois. The city of Belleville is the county seat. With FIPS code of 163, St. Clair County has a population of 254,796 and area of 657 square miles (1,702 km²).
List of all cities in Saint Clair County, IL alphabetically
| City/Town | Postal Code | Area Code |
| Alorton, IL | 62207 | 618/730 |
| Belleville, IL | 62220 | 618/730 |
| 62221 | 618/730 | |
| 62222 | 618/730 | |
| 62223 | 618/730 | |
| 62225 | 618/730 | |
| 62226 | 618/730 | |
| 62269 | 618/730 | |
| Brooklyn, IL | 62059 | 618/730 |
| Cahokia, IL | 62206 | 618/730 |
| Caseyville, IL | 62232 | 618/730 |
| 62203 | 618/730 | |
| 62205 | 618/730 | |
| 62207 | 618/730 | |
| Darmstadt, IL | 62255 | 618/730 |
| Dupo, IL | 62239 | 618/730 |
| East Carondelet, IL | 62240 | 618/730 |
| East Saint Louis, IL | 62201 | 618/730 |
| 62202 | 618/730 | |
| 62203 | 618/730 | |
| 62204 | 618/730 | |
| 62205 | 618/730 | |
| 62206 | 618/730 | |
| 62207 | 618/730 | |
| 62208 | 618/730 | |
| Fairmont City, IL | 62201 | 618/730 |
| Fairview Heights, IL | 62208 | 618/730 |
| 62232 | 618/730 | |
| Fayetteville, IL | 62258 | 618/730 |
| Freeburg, IL | 62243 | 618/730 |
| Hollywood Heights, IL | 62232 | 618/730 |
| IMBS, IL | 62240 | 618/730 |
| Lebanon, IL | 62254 | 618/730 |
| Lenzburg, IL | 62255 | 618/730 |
| Lovejoy, IL | 62059 | 618/730 |
| Marissa, IL | 62257 | 618/730 |
| Marrisa, IL | 62257 | 618/730 |
| Mascoutah, IL | 62258 | 618/730 |
| Millstadt, IL | 62260 | 618/730 |
| National Stock Yard, IL | 62071 | 618/730 |
| 62071 | 618/730 | |
| New Athens, IL | 62264 | 618/730 |
| O Fallon, IL | 62269 | 618/730 |
| Rentchler, IL | 62221 | 618/730 |
| Saint Libory, IL | 62282 | 618/730 |
| Sauget, IL | 62201 | 618/730 |
| Sauget, IL | 62206 | 618/730 |
| Scott Air Force Base, IL | 62225 | 618/730 |
| Shiloh, IL | 62221 | 618/730 |
| 62269 | 618/730 | |
| Signal Hill, IL | 62223 | 618/730 |
| Smithton, IL | 62285 | 618/730 |
| Stites, IL | 62059 | 618/730 |
| Summerfield, IL | 62289 | 618/730 |
| Swansea, IL | 62220 | 618/730 |
| 62221 | 618/730 | |
| 62223 | 618/730 | |
| 62226 | 618/730 | |
| Washington Park, IL | 62204 | 618/730 |
| 62205 | 618/730 |
Major Cities and Towns in Saint Clair County, Illinois
Belleville
Location and History
Belleville, the county seat of Saint Clair County, is located in southwestern Illinois, just 16 miles southeast of St. Louis, Missouri. Established in 1814, Belleville rapidly grew into an industrial and cultural hub, attracting many German immigrants in the 19th century, which greatly influenced the city’s cultural development. Its proximity to St. Louis has historically played a significant role in its growth, as the city became a vital residential and commercial center in the region. Belleville is known for its rich architectural history, with many Victorian homes and historic buildings, including the iconic Belleville Public Square.
Area, Population, Zip Codes, Latitude and Longitude
- Area: 23.29 square miles
- Population: Approximately 42,400 (as of 2020 census)
- Zip Codes: 62220, 62221, 62223, 62226
- Latitude: 38.5201° N
- Longitude: 89.9837° W
Major Schools and Landmarks
Belleville is served by multiple school districts, including Belleville Township High School District 201, which operates Belleville East and Belleville West high schools. Major landmarks include the Belle-Clair Fairgrounds & Expo Center, which hosts various community events and fairs throughout the year, and the National Shrine of Our Lady of the Snows, one of the largest outdoor shrines in North America. Downtown Belleville is also home to a variety of historic sites, including the Belleville Philharmonic Society, one of the oldest continuously operating orchestras in the United States, and the Cathedral of Saint Peter.
O’Fallon
Location and History
O’Fallon is located in the northern part of Saint Clair County, just 18 miles east of St. Louis. Established in 1854, the city developed rapidly after the construction of the O’Fallon Station on the Ohio and Mississippi Railroad. Named after Colonel John O’Fallon, a wealthy philanthropist, the town originally thrived as a transportation and agricultural center. Over the years, O’Fallon has evolved into one of the fastest-growing cities in the region, becoming a suburban hub for residents commuting to St. Louis. The city’s growth has been driven by its excellent schools, expanding residential developments, and strong community values.
Area, Population, Zip Codes, Latitude and Longitude
- Area: 15.85 square miles
- Population: Approximately 32,300 (as of 2020 census)
- Zip Codes: 62269
- Latitude: 38.5926° N
- Longitude: 89.9113° W
Major Schools and Landmarks
O’Fallon is served by the O’Fallon Township High School District 203 and O’Fallon Community Consolidated School District 90, with O’Fallon Township High School being a major educational institution in the area. Key landmarks include the O’Fallon Family Sports Park, which features baseball fields, soccer fields, and walking trails. The city also boasts the historic Rock Springs Park, a popular recreational area. Another important site is the St. Clair Square Mall, a regional shopping center that attracts visitors from throughout the county. O’Fallon’s blend of suburban living and outdoor recreation makes it a popular place for families.
East St. Louis
Location and History
East St. Louis is located directly across the Mississippi River from St. Louis, Missouri, and is part of the Greater St. Louis metropolitan area. Founded in the early 1800s, East St. Louis grew into a major industrial city due to its strategic location as a transportation hub. The city became a center for manufacturing, shipping, and railroads. However, East St. Louis faced economic challenges in the late 20th century due to industrial decline, leading to significant population loss. Despite these challenges, East St. Louis is known for its historical significance and cultural contributions, particularly in the areas of jazz and blues music.
Area, Population, Zip Codes, Latitude and Longitude
- Area: 14.37 square miles
- Population: Approximately 18,400 (as of 2020 census)
- Zip Codes: 62201, 62203, 62204, 62205
- Latitude: 38.6245° N
- Longitude: 90.1503° W
Major Schools and Landmarks
East St. Louis is served by the East St. Louis School District 189, with East St. Louis Senior High School being the main high school in the area. Notable landmarks include the Gateway Geyser, a fountain that shoots water 630 feet into the air, mirroring the height of the St. Louis Gateway Arch across the river. The Katherine Dunham Museum, dedicated to the famed African American dancer and choreographer, is another key cultural site in the city. East St. Louis also has a rich history of jazz music, and its cultural heritage continues to shape the community.
Fairview Heights
Location and History
Fairview Heights is located in the northwestern part of Saint Clair County, just 12 miles east of St. Louis. Established in 1969, Fairview Heights quickly grew into a thriving suburban community due to its proximity to Interstate 64 and easy access to St. Louis. The city developed as a commercial center, with retail and service industries driving much of its growth. Over the past few decades, Fairview Heights has become known as a major shopping destination in the region, with numerous shopping centers and restaurants attracting visitors from throughout the county and beyond.
Area, Population, Zip Codes, Latitude and Longitude
- Area: 11.5 square miles
- Population: Approximately 17,000 (as of 2020 census)
- Zip Codes: 62208
- Latitude: 38.5923° N
- Longitude: 89.9907° W
Major Schools and Landmarks
Fairview Heights is part of the Pontiac-William Holliday School District 105 and the Grant Community Consolidated School District 110. Major landmarks in the city include the St. Clair Square Mall, the largest shopping center in southern Illinois, featuring major retailers and dining options. The Fairview Heights Public Library and the recently developed Pleasant Ridge Park offer residents a range of recreational and cultural activities. The city is also home to a variety of community events, including holiday parades and festivals, making it a lively suburban center.
Collinsville
Location and History
Collinsville is located on the western edge of Saint Clair County, straddling the county line with Madison County, just 12 miles from downtown St. Louis. Founded in 1837, Collinsville grew as a coal mining town, with its economy driven by the extraction of bituminous coal. Over time, the city became known for its agricultural production, particularly horseradish, earning it the nickname “Horseradish Capital of the World.” Today, Collinsville is a residential and commercial hub within the St. Louis metropolitan area, known for its local festivals and unique historical attractions.
Area, Population, Zip Codes, Latitude and Longitude
- Area: 14.87 square miles
- Population: Approximately 25,600 (as of 2020 census)
- Zip Codes: 62234
- Latitude: 38.6700° N
- Longitude: 89.9865° W
Major Schools and Landmarks
Collinsville is served by the Collinsville Community Unit School District 10, with Collinsville High School being the main high school. One of the city’s most famous landmarks is the Cahokia Mounds State Historic Site, a UNESCO World Heritage Site that preserves the remains of a prehistoric Native American city. Collinsville is also home to the World’s Largest Catsup Bottle, a 170-foot-tall water tower built in 1949. The annual International Horseradish Festival celebrates the city’s agricultural heritage, drawing visitors from across the region. Collinsville’s mix of history, culture, and community events make it a unique city within the region.
Shiloh
Location and History
Shiloh is a small village located in northern Saint Clair County, just a few miles from Belleville and O’Fallon. Founded in 1807, Shiloh originally developed as a farming community. The village remained small throughout the 19th and early 20th centuries but saw rapid growth in recent decades due to its proximity to Scott Air Force Base and the suburban expansion of nearby cities. Shiloh’s quiet neighborhoods and excellent schools have made it a desirable place to live for families and military personnel stationed at the nearby base.
Area, Population, Zip Codes, Latitude and Longitude
- Area: 11.58 square miles
- Population: Approximately 13,000 (as of 2020 census)
- Zip Codes: 62221, 62269
- Latitude: 38.5478° N
- Longitude: 89.9062° W
Major Schools and Landmarks
Shiloh is served by the Shiloh Village School District, with Shiloh Middle School being a key educational institution. Major landmarks in the village include the Tamarack Golf Course and the Shiloh Community Park, which offers walking trails, playgrounds, and sports facilities. Shiloh is also located near Scott Air Force Base, which plays a significant role in the local economy and community life. The village has a number of newer residential developments, providing a suburban lifestyle while retaining its small-town charm.
