ZIP Code 73639 — Custer City, OK
73639 is a standard (street delivery) ZIP code serving Custer City, Oklahoma, in Custer County. To mail something here you only need these five digits — but the four-digit extension narrows delivery to a single point, and it is what USPS bulk postage discounts are priced on.
ZIP code 73639 at a glance
| ZIP code | 73639 |
|---|---|
| Primary city | Custer City |
| State | Oklahoma (OK) |
| County | Custer FIPS 40039 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 817 |
| Coordinates | 35.726660, -98.955780 |
How ZIP+4 works in 73639
The four digits after the hyphen encode a delivery segment inside 73639. In practice one segment usually means:
- One side of one block — odd numbers on a street between two cross streets
- A single large building, or one floor of it
- A group of PO boxes, sometimes a single box
- A single business that receives enough mail to warrant its own code
That is why 73639 has no single ZIP+4: two neighbors across the street from each other usually have different ones. Enter a street address above and we will return the exact nine-digit code along with the standardized USPS address format.
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 73639.
| ZIP | City | Distance |
|---|---|---|
| 73620 | Arapaho, OK | 8.6 mi |
| 73659 | Putnam, OK | 10.1 mi |
| 73669 | Thomas, OK | 12 mi |
| 73625 | Butler, OK | 13.7 mi |
| 73601 | Clinton, OK | 15.7 mi |
| 73096 | Weatherford, OK | 19.4 mi |
| 73667 | Taloga, OK | 19.7 mi |
| 73646 | Fay, OK | 20.1 mi |
| 73658 | Oakwood, OK | 20.3 mi |
| 73835 | Camargo, OK | 22.3 mi |
| 73647 | Foss, OK | 22.4 mi |
| 73622 | Bessie, OK | 23 mi |
Questions about 73639
What is the ZIP+4 code for 73639?
73639 is the five-digit ZIP code. The ZIP+4 adds four more digits that identify a specific delivery point — usually one side of a city block, a single building, or a group of PO boxes. Because those four digits change from address to address within 73639, you need to look up a specific street address to get them.
What city is 73639?
73639 is assigned to Custer City, Oklahoma, in Custer County.
Do I need to use the ZIP+4?
It is optional for ordinary mail, but it speeds up sorting and it is required for most USPS bulk-mail postage discounts. Many address-verification and e-commerce systems also use ZIP+4 to confirm a delivery point exists.
Need thousands of these?
Upload a CSV and get ZIP+4, county, carrier route, and delivery-point data appended to every row — or call the API directly.