| ZIP Codes: | 15 ZIP Codes (13 Standard, 2 PO Box, 0 Unique) [See All] |
| Area Codes: | 618 / 730 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 11:53:21 PM |
| Population: | 32,473 [See All] |
| FIPS: | 17157 |
| Land Area: | 783 sq mi |
| Water Area: | 21 sq mi |
| Coordinates: | 38.0553, -89.8153 |
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32,473 residents live across 15 ZIPs covering 783 sq mi, served by 15 distinct USPS-recognized cities.
Population moved from 36,663 to 32,473 from 2014 to 2024 — a -11.4% change. 3 ZIPs gained residents, 11 lost.
The county's wealthiest ZIP 62217 (Baldwin, $84,615 median) and poorest ZIP 62292 (Tilden, $47,857) are 8.1 miles apart — a 1.8× income gap across local geography.
Median home values vary 3.0× across this county — from $70,300 in 62292 (Tilden) to $210,800 in 62280 (Rockwood).
Density varies 253× across the county — from 7 people/sq mi in 62280 (Rockwood) to 1,885 in 62292 (Tilden).
Educational attainment ranges from 5.6% bachelor's+ in 62292 (Tilden) to 23.2% in 62278 (Red Bud) — the breadth of educational profiles across the area.
Within Illinois, this is the #47 most populous of 102 counties and ranks #63 for median household income .
Weighted by population, the typical household earns about $71,550 across the county — reflecting what a typical resident sees, not a simple ZIP average.
15.2% of adults age 25+ hold a bachelor's degree or higher (3,635 of 23,859 reporting).
13 Standard delivery, 2 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.
Randolph County lost 11.4% of residents between 2014 and 2024. ZIPs that shed the largest share:
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 62233 | Chester | Standard | 8,326 | $84,556 | 96.7 | -14.8% |
| 62278 | Red Bud | Standard | 6,281 | $79,688 | 105.1 | -11.8% |
| 62286 | Sparta | Standard | 5,491 | $61,220 | 98.7 | -9.6% |
| 62288 | Steeleville | Standard | 2,820 | $67,159 | 39.4 | -2.3% |
| 62237 | Coulterville | Standard | 2,367 | $55,208 | 101.9 | -14.5% |
| 62242 | Evansville | Standard | 1,660 | $60,400 | 52.2 | 19.3% |
| 62272 | Percy | Standard | 1,521 | $50,938 | 35.2 | -10.8% |
| 62277 | Prairie Du Rocher | Standard | 940 | $67,969 | 66.8 | -37.9% |
| 62241 | Ellis Grove | Standard | 879 | $83,438 | 37.9 | -25.3% |
| 62217 | Baldwin | Standard | 767 | $84,615 | 34.9 | 3.9% |
| 62292 | Tilden | PO Box | 762 | $47,857 | 0.4 | 8.5% |
| 62280 | Rockwood | Standard | 421 | $62,353 | 56.5 | -1.2% |
| 62297 | Walsh | Standard | 158 | $90,938 | 23.4 | -35.2% |
| 62261 | Modoc | Standard | 80 | — | 33.8 | -46.3% |
| 62259 | Menard | PO Box | — | — | 0.1 | — |