| ZIP Codes: | 11 ZIP Codes (10 Standard, 1 PO Box, 0 Unique) [See All] |
| Area Codes: | 217 / 309 / 447 / 861 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:12:02 PM |
| Population: | 26,470 [See All] |
| FIPS: | 17109 |
| CBSA: | Macomb, IL |
| Land Area: | 566 sq mi |
| Water Area: | 1 sq mi |
| Coordinates: | 40.4846, -90.6658 |
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26,470 residents live across 11 ZIPs covering 566 sq mi, served by 11 distinct USPS-recognized cities.
Population moved from 32,160 to 26,470 from 2014 to 2024 — a -17.7% change. 3 ZIPs gained residents, 8 lost.
The county's wealthiest ZIP 61475 (Sciota, $85,000 median) and poorest ZIP 61416 (Bardolph, $28,750) are 12.0 miles apart — a 3.0× income gap across local geography.
Median home values vary 3.0× across this county — from $49,300 in 61416 (Bardolph) to $148,200 in 61438 (Good Hope).
Density varies 84× across the county — from 5 people/sq mi in 61475 (Sciota) to 380 in 61416 (Bardolph).
Educational attainment ranges from 3.2% bachelor's+ in 62374 (Tennessee) to 55.1% in 61475 (Sciota) — the breadth of educational profiles across the area.
Within Illinois, this is the #51 most populous of 102 counties and ranks #78 for median household income .
Weighted by population, the typical household earns about $54,962 across the county — reflecting what a typical resident sees, not a simple ZIP average.
31.6% of adults age 25+ hold a bachelor's degree or higher (5,140 of 16,267 reporting).
10 Standard delivery, 1 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.
One ZIP holds the majority of this county's population — a sign of a county built around a single city or town.
Mcdonough County lost 17.7% of residents between 2014 and 2024. ZIPs that shed the largest share:
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 61455 | Macomb | Standard | 17,317 | $48,679 | 155.4 | -21.6% |
| 61422 | Bushnell | Standard | 3,002 | $68,207 | 44.7 | -8.1% |
| 62326 | Colchester | Standard | 2,236 | $65,000 | 85.3 | 1.8% |
| 61420 | Blandinsville | Standard | 968 | $69,375 | 69.6 | -13.6% |
| 61440 | Industry | Standard | 744 | $66,786 | 47.9 | 13.1% |
| 61438 | Good Hope | Standard | 739 | $68,516 | 37.6 | -16.1% |
| 61470 | Prairie City | Standard | 488 | $72,708 | 21.9 | -27.9% |
| 61411 | Adair | Standard | 376 | — | 39.0 | 9.3% |
| 62374 | Tennessee | Standard | 216 | $78,571 | 24.8 | -43.5% |
| 61416 | Bardolph | PO Box | 204 | $28,750 | 0.5 | -10.1% |
| 61475 | Sciota | Standard | 180 | $85,000 | 39.8 | -43.9% |