St. Clair County, Illinois ZIP codes
30 ZIP codes are in St. Clair County, plus 7 that cross in from neighboring counties. It's part of the St. Louis, MO-IL metro area.
- ZIP codes
- 30
- Population in these ZIPs
- 247,743
- Avg. median income
- $76,200population-weighted
- Cities & towns
- 20
Click anywhere on the map to see which ZIP code it's in.
ZIP codes in St. Clair County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 62059 | Lovejoy | 729 | $30,673 | $37,500 |
| 62071 PO Box | National Stock Yards | — | — | — |
| 62201 | East Saint Louis | 4,921 | $27,437 | $56,900 |
| 62202 PO Box | East Saint Louis | — | — | — |
| 62203 | East Saint Louis | 5,465 | $42,111 | $38,900 |
| 62204 | East Saint Louis | 4,055 | $35,346 | $33,600 |
| 62205 | East Saint Louis | 6,459 | $45,672 | $32,300 |
| 62206 | East Saint Louis | 12,959 | $33,838 | $48,900 |
| 62207 | East Saint Louis | 6,984 | $29,845 | $39,100 |
| 62208 | Fairview Heights | 16,821 | $80,205 | $194,200 |
| 62220 | Belleville | 19,152 | $65,952 | $153,100 |
| 62221 | Belleville | 29,875 | $82,271 | $250,800 |
| 62222 PO Box | Belleville | — | — | — |
| 62223 | Belleville | 16,269 | $73,700 | $180,200 |
| 62225 | Scott Air Force Base | 5,242 | $103,284 | — |
| 62226 | Belleville | 28,255 | $70,797 | $182,400 |
| 62232 | Caseyville | 7,063 | $64,269 | $141,200 |
| 62239 | Dupo | 4,232 | $61,191 | $131,300 |
| 62240 | East Carondelet | 1,796 | $96,063 | $84,800 |
| 62243 | Freeburg | 6,418 | $103,342 | $265,500 |
| 62254 | Lebanon | 6,710 | $96,492 | $208,100 |
| 62255 | Lenzburg | 1,092 | $80,506 | $110,100 |
| 62257 | Marissa | 2,046 | $78,750 | $109,400 |
| 62258 | Mascoutah | 10,437 | $94,655 | $259,300 |
| 62260 | Millstadt | 6,668 | $91,039 | $295,900 |
| 62264 | New Athens | 3,097 | $57,015 | $160,900 |
| 62269 | O Fallon | 35,923 | $103,818 | $312,000 |
| 62282 | Saint Libory | 563 | $117,143 | $179,300 |
| 62285 | Smithton | 4,239 | $136,345 | $309,300 |
| 62289 | Summerfield | 273 | $47,237 | $64,500 |
ZIP codes partly in St. Clair County
These ZIP codes are mostly in a neighboring county but cover part of St. Clair County.
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 62060 | Madison | Madison County | 3,558 | $46,563 | $49,100 |
| 62234 | Collinsville | Madison County | 31,648 | $69,607 | $195,500 |
| 62236 | Columbia | Monroe County | 14,154 | $108,981 | $343,000 |
| 62265 | New Baden | Clinton County | 4,555 | $84,853 | $230,100 |
| 62293 | Trenton | Clinton County | 4,433 | $98,155 | $266,300 |
| 62294 | Troy | Madison County | 15,325 | $120,466 | $331,300 |
| 62298 | Waterloo | Monroe County | 18,208 | $101,155 | $325,200 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities and towns in St. Clair County
Nearby counties
Frequently asked questions
How many ZIP codes are in St. Clair County, Illinois?
30 ZIP codes are mainly in St. Clair County, and 7 more ZIP codes from neighboring areas reach partly into it.
What cities are in St. Clair County?
ZIP codes in St. Clair County use the city names Belleville, Caseyville, Dupo, East Carondelet, East Saint Louis, Fairview Heights, Freeburg, Lebanon, Lenzburg, Lovejoy, Marissa and Mascoutah and others.
What metro area is St. Clair County in?
St. Clair County is part of the St. Louis, MO-IL metropolitan statistical area.