| ZIP Codes: | 9 ZIP Codes (9 Standard, 0 PO Box, 0 Unique) [See All] |
| Area Code: | 785 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:12:14 PM |
| Population: | 10,088 [See All] |
| FIPS: | 20131 |
| Land Area: | 687 sq mi |
| Water Area: | 2 sq mi |
| Coordinates: | 39.7884, -95.9936 |
| Quick Link: |
10,088 residents live across 9 ZIPs covering 687 sq mi, served by 9 distinct USPS-recognized cities.
Population moved from 10,147 to 10,088 from 2014 to 2024 — a -0.6% change. 3 ZIPs gained residents, 6 lost.
The county's wealthiest ZIP 66428 (Goff, $100,500 median) and poorest ZIP 66522 (Oneida, $57,500) are 12.6 miles apart — a 1.7× income gap across local geography.
Median home values vary 6.0× across this county — from $50,000 in 66522 (Oneida) to $299,300 in 66538 (Seneca).
Density varies 360× across the county — from 3 people/sq mi in 66428 (Goff) to 1,017 in 66522 (Oneida).
Educational attainment ranges from 7.4% bachelor's+ in 66522 (Oneida) to 36.8% in 66428 (Goff) — the breadth of educational profiles across the area.
Within Kansas, this is the #39 most populous of 106 counties and ranks #17 for median household income .
Weighted by population, the typical household earns about $76,927 across the county — reflecting what a typical resident sees, not a simple ZIP average.
29.9% of adults age 25+ hold a bachelor's degree or higher (1,987 of 6,644 reporting).
9 Standard delivery, 0 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 |
|---|---|---|---|---|---|---|
| 66538 | Seneca | Standard | 3,602 | $78,981 | 144.7 | 28.7% |
| 66534 | Sabetha | Standard | 3,381 | $73,050 | 142.3 | -12.5% |
| 66415 | Centralia | Standard | 762 | $70,066 | 88.0 | -27.1% |
| 66550 | Wetmore | Standard | 552 | $59,531 | 61.8 | -8.2% |
| 66417 | Corning | Standard | 507 | $86,875 | 48.7 | 79.2% |
| 66404 | Baileyville | Standard | 481 | $89,620 | 65.8 | -1.6% |
| 66408 | Bern | Standard | 427 | $91,250 | 48.7 | -28.5% |
| 66428 | Goff | Standard | 246 | $100,500 | 87.1 | -43.3% |
| 66522 | Oneida | Standard | 130 | $57,500 | 0.1 | 271.4% |