| ZIP Codes: | 5 ZIP Codes (5 Standard, 0 PO Box, 0 Unique) [See All] |
| Area Codes: | 785 / 913 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:12:10 PM |
| Population: | 16,016 [See All] |
| FIPS: | 20005 |
| CBSA: | Atchison, KS |
| Land Area: | 379 sq mi |
| Water Area: | 3 sq mi |
| Coordinates: | 39.5365, -95.3257 |
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16,016 residents live across 5 ZIPs covering 379 sq mi, served by 5 distinct USPS-recognized cities.
Population moved from 16,403 to 16,016 from 2014 to 2024 — a -2.4% change. 1 ZIPs gained residents, 4 lost.
The county's wealthiest ZIP 66058 (Muscotah, $96,458 median) and poorest ZIP 66023 (Effingham, $55,759) are 7.4 miles apart — a 1.7× income gap across local geography.
Median home values vary 2.6× across this county — from $110,400 in 66023 (Effingham) to $292,500 in 66016 (Cummings).
Density varies 7× across the county — from 10 people/sq mi in 66058 (Muscotah) to 71 in 66002 (Atchison).
Educational attainment ranges from 8.3% bachelor's+ in 66041 (Lancaster) to 25.1% in 66002 (Atchison) — the breadth of educational profiles across the area.
Within Kansas, this is the #32 most populous of 106 counties and ranks #40 for median household income .
Weighted by population, the typical household earns about $62,121 across the county — reflecting what a typical resident sees, not a simple ZIP average.
22.2% of adults age 25+ hold a bachelor's degree or higher (2,136 of 9,626 reporting).
5 Standard delivery, 0 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.