| ZIP Codes: | 4 ZIP Codes (4 Standard, 0 PO Box, 0 Unique) [See All] |
| Area Code: | 580 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 11:54:44 PM |
| Population: | 3,463 [See All] |
| FIPS: | 40059 |
| Land Area: | 1,328 sq mi |
| Water Area: | 2 sq mi |
| Coordinates: | 36.7257, -99.7941 |
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3,463 residents live across 4 ZIPs covering 1,328 sq mi, served by 4 distinct USPS-recognized cities.
Population moved from 3,966 to 3,463 from 2014 to 2024 — a -12.7% change. 2 ZIPs gained residents, 2 lost.
The county's wealthiest ZIP 73834 (Buffalo, $72,500 median) and poorest ZIP 73848 (Laverne, $57,619) are 26.6 miles apart — a 1.3× income gap across local geography.
Median home values vary 3.2× across this county — from $57,300 in 73851 (May) to $185,700 in 73855 (Rosston).
Density varies 2× across the county — from 1 people/sq mi in 73855 (Rosston) to 3 in 73834 (Buffalo).
Educational attainment ranges from 19.8% bachelor's+ in 73851 (May) to 61.6% in 73855 (Rosston) — the breadth of educational profiles across the area.
Within Oklahoma, this is the #76 most populous of 78 counties and ranks #28 for median household income .
Weighted by population, the typical household earns about $64,769 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 (741 of 2,475 reporting).
4 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.
Harper County lost 12.7% of residents between 2014 and 2024. ZIPs that shed the largest share: