| ZIP Codes: | 9 ZIP Codes (5 Standard, 3 PO Box, 1 Unique) [See All] |
| Area Code: | 580 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:13:27 PM |
| Population: | 44,421 [See All] |
| FIPS: | 40137 |
| CBSA: | Duncan, OK |
| Land Area: | 1,047 sq mi |
| Water Area: | 18 sq mi |
| Coordinates: | 34.4813, -97.8052 |
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44,421 residents live across 9 ZIPs covering 1,047 sq mi, served by 7 distinct USPS-recognized cities.
Population moved from 45,162 to 44,421 from 2014 to 2024 — a -1.6% change. 3 ZIPs gained residents, 4 lost.
The county's wealthiest ZIP 73491 (Velma, $83,750 median) and poorest ZIP 73442 (Loco, $52,292) are 10.3 miles apart — a 1.6× income gap across local geography.
Median home values vary 2.2× across this county — from $114,200 in 73529 (Comanche) to $255,000 in 73434 (Foster).
Density varies 194× across the county — from 2 people/sq mi in 73442 (Loco) to 479 in 73491 (Velma).
Educational attainment ranges from 12.2% bachelor's+ in 73491 (Velma) to 23.7% in 73055 (Marlow) — the breadth of educational profiles across the area.
Within Oklahoma, this is the #19 most populous of 78 counties and ranks #31 for median household income .
Hosts 1 single-entity Unique ZIP: 73536Halliburton .
Weighted by population, the typical household earns about $62,724 across the county — reflecting what a typical resident sees, not a simple ZIP average.
20.8% of adults age 25+ hold a bachelor's degree or higher (6,424 of 30,822 reporting).
5 Standard delivery, 3 PO Box only, 1 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.
One ZIP holds the majority of this county's population — a sign of a county built around a single city or town.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 73533 | Duncan | Standard | 27,618 | $59,906 | 330.2 | -2.2% |
| 73055 | Marlow | Standard | 10,064 | $65,991 | 281.4 | 1.1% |
| 73529 | Comanche | Standard | 4,898 | $70,143 | 213.5 | -2.7% |
| 73491 | Velma | PO Box | 791 | $83,750 | 1.7 | -6.1% |
| 73434 | Foster | Standard | 574 | $63,214 | 108.8 | 9.5% |
| 73442 | Loco | Standard | 275 | $52,292 | 111.2 | -47.4% |
| 73425 | Countyline | PO Box | 201 | $35,637 | 0.0 | 279.2% |
| 73536 | Duncan | Unique | — | — | 0.0 | — |
| 73534 | Duncan | PO Box | — | — | 0.0 | — |