| ZIP Codes: | 8 ZIP Codes (8 Standard, 0 PO Box, 0 Unique) [See All] |
| Area Codes: | 618 / 730 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 11:53:17 PM |
| Population: | 19,877 [See All] |
| FIPS: | 17051 |
| Land Area: | 632 sq mi |
| Water Area: | 2 sq mi |
| Coordinates: | 38.9851, -88.9979 |
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19,877 residents live across 8 ZIPs covering 632 sq mi, served by 8 distinct USPS-recognized cities.
Population moved from 20,120 to 19,877 from 2014 to 2024 — a -1.2% change. 3 ZIPs gained residents, 5 lost.
The county's wealthiest ZIP 62838 (Farina, $82,976 median) and poorest ZIP 62458 (Saint Elmo, $48,810) are 10.8 miles apart — a 1.7× income gap across local geography.
Median home values vary 1.6× across this county — from $94,000 in 62080 (Ramsey) to $150,200 in 62885 (Shobonier).
Density varies 9× across the county — from 8 people/sq mi in 62011 (Bingham) to 73 in 62471 (Vandalia).
Educational attainment ranges from 6.7% bachelor's+ in 62885 (Shobonier) to 21.8% in 62471 (Vandalia) — the breadth of educational profiles across the area.
Within Illinois, this is the #55 most populous of 102 counties and ranks #89 for median household income .
Weighted by population, the typical household earns about $62,394 across the county — reflecting what a typical resident sees, not a simple ZIP average.
17.6% of adults age 25+ hold a bachelor's degree or higher (2,500 of 14,176 reporting).
8 Standard delivery, 0 PO Box only, 0 single-entity Unique ZIPs serve this county.
A frontier county — vast land area with only a few residents per square mile. Daily life looks very different here than in the country's denser counties.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 62471 | Vandalia | Standard | 9,937 | $61,792 | 136.7 | 4.3% |
| 62080 | Ramsey | Standard | 3,255 | $67,717 | 127.0 | 26.7% |
| 62458 | Saint Elmo | Standard | 2,176 | $48,810 | 62.8 | -2.3% |
| 62418 | Brownstown | Standard | 1,809 | $58,448 | 88.6 | -2.2% |
| 62838 | Farina | Standard | 1,341 | $82,976 | 90.4 | -33.6% |
| 62880 | Saint Peter | Standard | 658 | $61,667 | 41.8 | 8.9% |
| 62885 | Shobonier | Standard | 474 | $64,688 | 56.0 | -54.8% |
| 62011 | Bingham | Standard | 227 | $49,821 | 28.3 | -18.1% |