ZIP Code 73533 — Duncan, OK
73533 is a standard (street delivery) ZIP code serving Duncan, Oklahoma, in Stephens 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 73533 at a glance
| ZIP code | 73533 |
|---|---|
| Primary city | Duncan |
| State | Oklahoma (OK) |
| County | Stephens FIPS 40137 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 27,618 |
| Coordinates | 34.494840, -97.847740 |
How ZIP+4 works in 73533
The four digits after the hyphen encode a delivery segment inside 73533. 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 73533 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 73533.
| ZIP | City | Distance |
|---|---|---|
| 73055 | Marlow, OK | 10.9 mi |
| 73491 | Velma, OK | 11 mi |
| 73529 | Comanche, OK | 12 mi |
| 73442 | Loco, OK | 14.9 mi |
| 73425 | Countyline, OK | 16.4 mi |
| 73488 | Tussy, OK | 17.1 mi |
| 73434 | Foster, OK | 17.4 mi |
| 73520 | Addington, OK | 17.7 mi |
| 73481 | Ratliff City, OK | 19.3 mi |
| 73082 | Rush Springs, OK | 19.4 mi |
| 73435 | Fox, OK | 22.2 mi |
| 73487 | Tatums, OK | 23.1 mi |
Questions about 73533
What is the ZIP+4 code for 73533?
73533 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 73533, you need to look up a specific street address to get them.
What city is 73533?
73533 is assigned to Duncan, Oklahoma, in Stephens 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.