| ZIP Codes: | 28 ZIP Codes (25 Standard, 2 PO Box, 1 Unique) [See All] |
| Area Codes: | 217 / 447 / 618 / 730 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:12:02 PM |
| Population: | 268,375 [See All] |
| FIPS: | 17119 |
| CBSA: | St. Louis, MO-IL |
| Land Area: | 732 sq mi |
| Water Area: | 26 sq mi |
| Coordinates: | 38.8322, -89.9681 |
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268,375 residents live across 28 ZIPs covering 732 sq mi, served by 27 distinct USPS-recognized cities.
Population moved from 271,982 to 267,524 from 2014 to 2024 — a -1.6% change. 12 ZIPs gained residents, 15 lost.
The county's wealthiest ZIP 62281 (Saint Jacob, $132,000 median) and poorest ZIP 62090 (Venice, $36,098) are 22.0 miles apart — a 3.7× income gap across local geography.
Median home values vary 8.5× across this county — from $37,400 in 62090 (Venice) to $319,600 in 62025 (Edwardsville).
Density varies 56× across the county — from 28 people/sq mi in 62074 (New Douglas) to 1,553 in 62024 (East Alton).
Educational attainment ranges from 3.3% bachelor's+ in 62018 (Cottage Hills) to 51.3% in 62025 (Edwardsville) — the breadth of educational profiles across the area.
Within Illinois, this is the #8 most populous of 102 counties and ranks #30 for median household income .
Hosts 1 single-entity Unique ZIP: 62026Southern Illinois University .
Weighted by population, the typical household earns about $79,643 across the county — reflecting what a typical resident sees, not a simple ZIP average.
30.8% of adults age 25+ hold a bachelor's degree or higher (57,834 of 187,638 reporting).
25 Standard delivery, 2 PO Box only, 1 single-entity Unique ZIPs serve this county.
Median household income spans 3.7× between the wealthiest and poorest ZIPs — a sign of significant intra-county inequality.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 62040 | Granite City | Standard | 40,404 | $60,031 | 58.3 | -6.1% |
| 62025 | Edwardsville | Standard | 35,520 | $100,741 | 112.9 | 5.3% |
| 62234 | Collinsville | Standard | 31,648 | $69,607 | 35.8 | -2.6% |
| 62002 | Alton | Standard | 29,543 | $61,414 | 45.4 | -9.0% |
| 62249 | Highland | Standard | 16,205 | $90,424 | 92.7 | 3.0% |
| 62035 | Godfrey | Standard | 15,892 | $93,973 | 46.9 | -2.4% |
| 62294 | Troy | Standard | 15,325 | $120,466 | 29.9 | 5.3% |
| 62034 | Glen Carbon | Standard | 14,870 | $101,260 | 13.9 | 6.7% |
| 62010 | Bethalto | Standard | 11,028 | $71,408 | 19.2 | -0.5% |
| 62095 | Wood River | Standard | 10,726 | $65,013 | 9.2 | -2.3% |
| 62024 | East Alton | Standard | 9,493 | $56,761 | 6.1 | -2.4% |
| 62062 | Maryville | Standard | 8,277 | $98,672 | 6.6 | 1.4% |
| 62060 | Madison | Standard | 3,558 | $46,563 | 5.1 | -27.2% |
| 62018 | Cottage Hills | Standard | 3,184 | $40,438 | 3.2 | -13.8% |
| 62281 | Saint Jacob | Standard | 3,059 | $132,000 | 33.3 | 40.8% |
| 62097 | Worden | Standard | 2,973 | $91,011 | 41.7 | 14.3% |
| 62067 | Moro | Standard | 2,203 | $72,431 | 17.3 | -11.8% |
| 62087 | South Roxana | Standard | 2,181 | $60,214 | 3.1 | -4.9% |
| 62001 | Alhambra | Standard | 1,869 | $98,558 | 48.9 | 10.5% |
| 62084 | Roxana | Standard | 1,631 | $63,226 | 3.2 | 5.5% |
| 62061 | Marine | Standard | 1,487 | $87,938 | 22.6 | -29.0% |
| 62048 | Hartford | Standard | 1,347 | $40,946 | 8.4 | -13.0% |
| 62074 | New Douglas | Standard | 1,205 | $79,808 | 43.5 | -13.4% |
| 62046 | Hamel | PO Box | 1,102 | $108,036 | 1.0 | 46.9% |
| 62090 | Venice | Standard | 1,039 | $36,098 | 1.8 | -4.1% |
| 62058 | Livingston | PO Box | 884 | $62,240 | 1.1 | 6.1% |
| 62021 | Dorsey | Standard | 871 | $107,454 | 20.5 | 19.6% |
| 62026 | Edwardsville | Unique | 851 | — | 0.2 | — |