| ZIP Codes: | 14 ZIP Codes (11 Standard, 3 PO Box, 0 Unique) [See All] |
| Area Codes: | 217 / 309 / 447 / 861 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:12:01 PM |
| Population: | 27,439 [See All] |
| FIPS: | 17107 |
| CBSA: | Lincoln, IL |
| Land Area: | 600 sq mi |
| Water Area: | 1 sq mi |
| Coordinates: | 40.1041, -89.3589 |
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27,439 residents live across 14 ZIPs covering 600 sq mi, served by 14 distinct USPS-recognized cities.
Population moved from 29,975 to 27,439 from 2014 to 2024 — a -8.5% change. 8 ZIPs gained residents, 6 lost.
The county's wealthiest ZIP 62671 (New Holland, $98,750 median) and poorest ZIP 62512 (Beason, $55,347) are 18.9 miles apart — a 1.8× income gap across local geography.
Median home values vary 1.7× across this county — from $87,800 in 62543 (Latham) to $150,800 in 61723 (Atlanta).
Density varies 18× across the county — from 7 people/sq mi in 62671 (New Holland) to 126 in 62656 (Lincoln).
Educational attainment ranges from 14.3% bachelor's+ in 62518 (Chestnut) to 31.4% in 62634 (Elkhart) — the breadth of educational profiles across the area.
Within Illinois, this is the #50 most populous of 102 counties and ranks #29 for median household income .
Weighted by population, the typical household earns about $67,992 across the county — reflecting what a typical resident sees, not a simple ZIP average.
20.9% of adults age 25+ hold a bachelor's degree or higher (4,105 of 19,597 reporting).
11 Standard delivery, 3 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.
Logan 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 |
|---|---|---|---|---|---|---|
| 62656 | Lincoln | Standard | 18,234 | $62,017 | 144.6 | -18.5% |
| 62548 | Mount Pulaski | Standard | 2,090 | $73,312 | 90.1 | 18.4% |
| 61723 | Atlanta | Standard | 2,005 | $85,230 | 67.3 | 13.8% |
| 62634 | Elkhart | Standard | 1,263 | $93,571 | 50.9 | 80.2% |
| 62643 | Hartsburg | Standard | 797 | $75,625 | 33.1 | 96.8% |
| 62635 | Emden | Standard | 661 | $77,750 | 39.0 | 10.2% |
| 62518 | Chestnut | Standard | 509 | — | 23.1 | 42.6% |
| 62666 | Middletown | Standard | 485 | $89,167 | 31.7 | -9.7% |
| 62543 | Latham | Standard | 477 | $73,594 | 23.7 | 19.3% |
| 62512 | Beason | Standard | 446 | $55,347 | 43.9 | -5.3% |
| 62671 | New Holland | Standard | 362 | $98,750 | 51.0 | 6.5% |
| 62541 | Lake Fork | PO Box | 54 | — | 0.0 | -46.5% |
| 61751 | Lawndale | PO Box | 32 | — | 1.9 | -67.7% |
| 62519 | Cornland | PO Box | 24 | — | 0.0 | -52.9% |