| ZIP Codes: | 24 ZIP Codes (18 Standard, 6 PO Box, 0 Unique) [See All] |
| Area Codes: | 217 / 447 / 779 / 815 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 11:53:18 PM |
| Population: | 27,600 [See All] |
| FIPS: | 17075 |
| Land Area: | 1,121 sq mi |
| Water Area: | 2 sq mi |
| Coordinates: | 40.7468, -87.8145 |
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27,600 residents live across 24 ZIPs covering 1,121 sq mi, served by 24 distinct USPS-recognized cities.
Population moved from 30,179 to 27,417 from 2014 to 2024 — a -9.2% change. 6 ZIPs gained residents, 15 lost.
The county's wealthiest ZIP 60948 (Loda, $106,250 median) and poorest ZIP 60968 (Thawville, $46,250) are 10.0 miles apart — a 2.3× income gap across local geography.
Median home values vary 3.0× across this county — from $75,600 in 60973 (Wellington) to $229,600 in 60948 (Loda).
Density varies 338× across the county — from 8 people/sq mi in 60968 (Thawville) to 2,678 in 60974 (Woodland).
Educational attainment ranges from 2.1% bachelor's+ in 60974 (Woodland) to 27.9% in 60924 (Cissna Park) — the breadth of educational profiles across the area.
Within Illinois, this is the #49 most populous of 102 counties and ranks #74 for median household income .
Weighted by population, the typical household earns about $68,273 across the county — reflecting what a typical resident sees, not a simple ZIP average.
17.9% of adults age 25+ hold a bachelor's degree or higher (3,467 of 19,355 reporting).
18 Standard delivery, 6 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.
Iroquois County lost 8.5% of residents between 2014 and 2024. ZIPs that shed the largest share:
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 60970 | Watseka | Standard | 5,991 | $46,688 | 131.4 | -16.3% |
| 60927 | Clifton | Standard | 2,300 | $102,143 | 72.9 | -4.7% |
| 60922 | Chebanse | Standard | 2,088 | $62,000 | 50.6 | -11.7% |
| 60953 | Milford | Standard | 2,075 | $59,135 | 152.1 | -15.2% |
| 60938 | Gilman | Standard | 2,035 | $73,244 | 58.4 | 2.2% |
| 60955 | Onarga | Standard | 1,953 | $79,034 | 84.9 | 5.9% |
| 60948 | Loda | Standard | 1,660 | $106,250 | 52.1 | 13.1% |
| 60924 | Cissna Park | Standard | 1,565 | $78,250 | 71.3 | -1.1% |
| 60966 | Sheldon | Standard | 1,385 | $46,944 | 60.5 | -10.5% |
| 60911 | Ashkum | Standard | 1,325 | $89,792 | 63.5 | -15.6% |
| 60951 | Martinton | Standard | 796 | $81,250 | 50.2 | 8.9% |
| 60930 | Danforth | Standard | 761 | $58,125 | 44.5 | -5.2% |
| 60918 | Buckley | Standard | 754 | $73,500 | 52.2 | -12.3% |
| 60931 | Donovan | Standard | 510 | $53,500 | 48.4 | -6.6% |
| 60928 | Crescent City | Standard | 493 | $55,000 | 9.7 | -39.0% |
| 60912 | Beaverville | Standard | 475 | $59,375 | 36.6 | -26.8% |
| 60968 | Thawville | Standard | 374 | $46,250 | 47.2 | 18.4% |
| 60973 | Wellington | Standard | 347 | $85,250 | 32.0 | -27.7% |
| 60974 | Woodland | PO Box | 297 | $51,932 | 0.1 | -24.4% |
| 60945 | Iroquois | PO Box | 183 | $52,188 | 0.6 | -1.1% |
| 60956 | Papineau | PO Box | 132 | $51,250 | 0.2 | — |
| 60967 | Stockland | PO Box | 51 | — | 0.0 | — |
| 60926 | Claytonville | PO Box | 50 | $45,313 | 0.7 | 150.0% |
| 60939 | Goodwine | PO Box | 0 | — | 0.6 | — |