| ZIP Codes: | 12 ZIP Codes (12 Standard, 0 PO Box, 0 Unique) [See All] |
| Area Codes: | 217 / 447 / 618 / 730 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 11:53:21 PM |
| Population: | 17,278 [See All] |
| FIPS: | 17173 |
| Land Area: | 648 sq mi |
| Water Area: | 9 sq mi |
| Coordinates: | 39.3279, -88.7834 |
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17,278 residents live across 12 ZIPs covering 648 sq mi, served by 12 distinct USPS-recognized cities.
Population moved from 19,252 to 17,278 from 2014 to 2024 — a -10.3% change. 2 ZIPs gained residents, 10 lost.
The county's wealthiest ZIP 62462 (Sigel, $102,708 median) and poorest ZIP 62463 (Stewardson, $58,214) are 8.4 miles apart — a 1.8× income gap across local geography.
Median home values vary 2.1× across this county — from $105,900 in 62422 (Cowden) to $218,400 in 62438 (Lakewood).
Density varies 7× across the county — from 8 people/sq mi in 62553 (Oconee) to 57 in 62565 (Shelbyville).
Educational attainment ranges from 7.0% bachelor's+ in 62431 (Herrick) to 39.7% in 62438 (Lakewood) — the breadth of educational profiles across the area.
Within Illinois, this is the #60 most populous of 102 counties and ranks #42 for median household income .
Weighted by population, the typical household earns about $71,602 across the county — reflecting what a typical resident sees, not a simple ZIP average.
17.8% of adults age 25+ hold a bachelor's degree or higher (2,233 of 12,519 reporting).
12 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.
Shelby County lost 10.3% of residents between 2014 and 2024. ZIPs that shed the largest share:
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 62565 | Shelbyville | Standard | 7,559 | $66,498 | 132.6 | 0.2% |
| 61957 | Windsor | Standard | 1,707 | $75,583 | 85.6 | -21.0% |
| 62571 | Tower Hill | Standard | 1,269 | $79,390 | 67.6 | -18.5% |
| 62463 | Stewardson | Standard | 1,103 | $58,214 | 41.7 | -8.2% |
| 62534 | Findlay | Standard | 1,041 | $68,750 | 60.6 | -9.6% |
| 62462 | Sigel | Standard | 971 | $102,708 | 38.7 | -10.2% |
| 62422 | Cowden | Standard | 926 | $75,074 | 45.3 | -20.8% |
| 62465 | Strasburg | Standard | 806 | $84,286 | 36.3 | -18.3% |
| 62431 | Herrick | Standard | 717 | $64,904 | 51.7 | -36.4% |
| 62444 | Mode | Standard | 623 | $62,358 | 28.5 | 70.7% |
| 62553 | Oconee | Standard | 318 | $92,083 | 37.8 | -37.6% |
| 62438 | Lakewood | Standard | 238 | $71,786 | 21.8 | -40.5% |