| ZIP Codes: | 7 ZIP Codes (6 Standard, 1 PO Box, 0 Unique) [See All] |
| Area Code: | 620 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:12:10 PM |
| Population: | 12,370 [See All] |
| FIPS: | 20001 |
| Land Area: | 494 sq mi |
| Water Area: | 5 sq mi |
| Coordinates: | 37.8611, -95.2993 |
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12,370 residents live across 7 ZIPs covering 494 sq mi, served by 7 distinct USPS-recognized cities.
Population moved from 13,049 to 12,340 from 2014 to 2024 — a -5.4% change. 2 ZIPs gained residents, 4 lost.
The county's wealthiest ZIP 66732 (Elsmore, $87,625 median) and poorest ZIP 66751 (La Harpe, $48,417) are 9.5 miles apart — a 1.8× income gap across local geography.
Median home values vary 3.6× across this county — from $57,700 in 66751 (La Harpe) to $206,600 in 66772 (Savonburg).
Density varies 11× across the county — from 6 people/sq mi in 66732 (Elsmore) to 65 in 66749 (Iola).
Educational attainment ranges from 7.0% bachelor's+ in 66732 (Elsmore) to 25.3% in 66755 (Moran) — the breadth of educational profiles across the area.
Within Kansas, this is the #36 most populous of 106 counties and ranks #59 for median household income .
Weighted by population, the typical household earns about $61,187 across the county — reflecting what a typical resident sees, not a simple ZIP average.
22.7% of adults age 25+ hold a bachelor's degree or higher (1,907 of 8,392 reporting).
6 Standard delivery, 1 PO Box only, 0 single-entity Unique ZIPs serve this county.
One ZIP holds the majority of this county's population — a sign of a county built around a single city or town.
Allen County lost 5.2% of residents between 2014 and 2024. ZIPs that shed the largest share:
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 66749 | Iola | Standard | 7,448 | $60,093 | 115.3 | -4.1% |
| 66748 | Humboldt | Standard | 2,830 | $59,871 | 111.1 | 18.5% |
| 66755 | Moran | Standard | 890 | $74,417 | 122.8 | -24.6% |
| 66751 | La Harpe | Standard | 590 | $48,417 | 46.1 | -46.8% |
| 66732 | Elsmore | Standard | 294 | $87,625 | 50.0 | 12.6% |
| 66772 | Savonburg | Standard | 288 | $60,703 | 48.2 | -15.5% |
| 66742 | Gas | PO Box | 30 | — | 0.0 | — |