Duncan, OK micro area ZIP codes
The Duncan, OK micropolitan statistical area (CBSA 20340) covers 1 county in Oklahoma and 9 ZIP codes.
- ZIP codes
- 9
- Population
- 44,421
- Avg. median income
- $62,700population-weighted
- Counties
- 1
Click anywhere on the map to see which ZIP code it's in.
Counties in the Duncan, OK area
ZIP codes in the Duncan, OK area
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 73055 | Marlow | Stephens County | 10,064 | $65,991 | $175,900 |
| 73425 | Countyline | Stephens County | 201 | $35,637 | — |
| 73434 | Foster | Stephens County | 574 | $63,214 | $262,900 |
| 73442 | Loco | Stephens County | 275 | $52,292 | $164,000 |
| 73491 | Velma | Stephens County | 791 | $83,750 | $114,600 |
| 73529 | Comanche | Stephens County | 4,898 | $70,143 | $133,500 |
| 73533 | Duncan | Stephens County | 27,618 | $59,906 | $134,100 |
| 73534 PO Box | Duncan | Stephens County | — | — | — |
| 73536 PO Box | Duncan | Stephens County | — | — | — |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Frequently asked questions
How many ZIP codes are in the Duncan, OK micro area?
9 ZIP codes, based on each ZIP code's main county.
Which counties make up the Duncan, OK area?
Stephens County.
What is an MSA?
A metropolitan statistical area (MSA) is a core city of 50,000+ people plus the surrounding counties tied to it by commuting, as defined by the U.S. Office of Management and Budget. Micropolitan areas have a core of 10,000–50,000. Together they are called core-based statistical areas (CBSAs).