| ZIP Codes: | 10 ZIP Codes (9 Standard, 1 PO Box, 0 Unique) [See All] |
| Area Code: | 785 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 11:53:32 PM |
| Population: | 21,983 [See All] |
| FIPS: | 20149 |
| CBSA: | Manhattan, KS |
| Land Area: | 919 sq mi |
| Water Area: | 21 sq mi |
| Coordinates: | 39.3462, -96.2818 |
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21,983 residents live across 10 ZIPs covering 919 sq mi, served by 10 distinct USPS-recognized cities.
Population moved from 20,375 to 21,983 from 2014 to 2024 — a +7.9% change. 5 ZIPs gained residents, 4 lost.
The county's wealthiest ZIP 66432 (Havensville, $108,818 median) and poorest ZIP 66521 (Onaga, $61,250) are 7.4 miles apart — a 1.8× income gap across local geography.
Median home values vary 1.4× across this county — from $193,000 in 66521 (Onaga) to $263,200 in 66432 (Havensville).
Density varies 17× across the county — from 5 people/sq mi in 66407 (Belvue) to 91 in 66535 (Saint George).
Educational attainment ranges from 8.3% bachelor's+ in 66422 (Emmett) to 41.4% in 66547 (Wamego) — the breadth of educational profiles across the area.
Within Kansas, this is the #24 most populous of 106 counties and ranks #6 for median household income with the #4 fastest decade growth .
Weighted by population, the typical household earns about $89,338 across the county — reflecting what a typical resident sees, not a simple ZIP average.
33.4% of adults age 25+ hold a bachelor's degree or higher (4,614 of 13,808 reporting).
9 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.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 66547 | Wamego | Standard | 8,579 | $103,454 | 140.9 | 14.1% |
| 66536 | Saint Marys | Standard | 4,204 | $85,568 | 65.8 | -5.6% |
| 66535 | Saint George | Standard | 3,556 | $78,642 | 39.0 | 25.3% |
| 66549 | Westmoreland | Standard | 1,526 | $79,318 | 185.2 | -15.3% |
| 66521 | Onaga | Standard | 1,417 | $61,250 | 189.1 | -26.5% |
| 66422 | Emmett | Standard | 1,228 | $73,257 | 57.1 | 215.7% |
| 66520 | Olsburg | Standard | 635 | $94,911 | 116.3 | 18.5% |
| 66432 | Havensville | Standard | 540 | $108,818 | 70.3 | 54.7% |
| 66407 | Belvue | Standard | 298 | $67,750 | 55.3 | -47.0% |
| 66426 | Fostoria | PO Box | — | — | 0.0 | — |