St. Clair County ZIP Codes

List of ZIP Codes in St. Clair County

The following table lists ZIP Codes associated with St. Clair County, Illinois, based on ZIP Code Tabulation Area (ZCTA) data from the U.S. Census Bureau.

S.N.	Zip Code	Latitude	Longitude	City	Population	Density
1	62059	38.65434	-90.17097	Lovejoy	811	476.7
2	62201	38.63567	-90.14162	East Saint Louis	5,017	160.9
3	62203	38.60223	-90.07534	East Saint Louis	5,539	378.6
4	62204	38.63033	-90.09642	East Saint Louis	4,824	403.3
5	62205	38.60259	-90.11469	East Saint Louis	5,760	349.8
6	62206	38.56796	-90.16981	East Saint Louis	13,155	349.3
7	62207	38.58327	-90.12544	East Saint Louis	6,801	423.5
8	62208	38.59641	-90.00528	Fairview Heights	16,653	480.1
9	62220	38.47247	-89.98704	Belleville	19,391	259.2
10	62221	38.51187	-89.89922	Belleville	29,281	323.3
11	62223	38.53491	-90.06027	Belleville	16,269	244.6
12	62225	38.54065	-89.85503	Scott Air Force Base	5,606	412.4
13	62226	38.53634	-90.00057	Belleville	28,543	794.3
14	62232	38.63266	-90.00509	Caseyville	7,480	225.2
15	62239	38.528	-90.1803	Dupo	4,381	197.9
16	62240	38.52084	-90.21011	East Carondelet	1,994	51.7
17	62243	38.41841	-89.88978	Freeburg	6,522	48.7
18	62254	38.6098	-89.81901	Lebanon	6,339	59.9
19	62255	38.31244	-89.77842	Lenzburg	1,231	18.0
20	62257	38.28048	-89.73262	Marissa	1,960	9.4
21	62258	38.46014	-89.77287	Mascoutah	10,292	52.7
22	62260	38.46097	-90.09891	Millstadt	6,518	57.4
23	62264	38.31612	-89.90721	New Athens	3,152	18.5
24	62269	38.59844	-89.91294	O'Fallon	35,536	459.9
25	62282	38.35644	-89.71334	Saint Libory	620	124.7
26	62285	38.38845	-90.00773	Smithton	4,187	99.5
27	62289	38.59788	-89.75096	Summerfield	385	99.2

About St. Clair County ZIP Codes

St. Clair County in Illinois (IL) is served by approximately 27 ZIP Codes. These codes cover residential neighborhoods, business districts, and rural areas that fall under the county's jurisdiction.

Based on ZIP-level population estimates, the total population covered by these ZIP Codes is around 248,247 people. Population and density values vary from one ZIP Code to another, reflecting the mix of dense urban communities and lower-density suburban or rural zones.

Many of the most significant population centers in St. Clair County are located in cities such as Belleville, East Saint Louis, O'Fallon, Fairview Heights, Mascoutah. These cities and towns help define the economic and demographic character of the county.

Most ZIP Codes in St. Clair County, Illinois follow the America/Chicago time zone.

St. Clair County ZIP Codes

List of ZIP Codes in St. Clair County

About St. Clair County ZIP Codes

Illinois Counties ZIP Codes

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