ZIP Code 74631 — Blackwell, OK
74631 is a standard (street delivery) ZIP code serving Blackwell, Oklahoma, in Kay 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 74631 at a glance
| ZIP code | 74631 |
|---|---|
| Primary city | Blackwell |
| State | Oklahoma (OK) |
| County | Kay FIPS 40071 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 6,689 |
| Coordinates | 36.798580, -97.305850 |
How ZIP+4 works in 74631
The four digits after the hyphen encode a delivery segment inside 74631. 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 74631 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 74631.
| ZIP | City | Distance |
|---|---|---|
| 74646 | Nardin, OK | 7.6 mi |
| 74632 | Braman, OK | 9.9 mi |
| 74653 | Tonkawa, OK | 10.7 mi |
| 74601 | Ponca City, OK | 11 mi |
| 74636 | Deer Creek, OK | 12.1 mi |
| 74643 | Lamont, OK | 15.8 mi |
| 74647 | Newkirk, OK | 18.6 mi |
| 74604 | Ponca City, OK | 19.3 mi |
| 67140 | South Haven, KS | 19.6 mi |
| 74644 | Marland, OK | 20.2 mi |
| 67051 | Geuda Springs, KS | 21 mi |
| 74630 | Billings, OK | 21.9 mi |
Questions about 74631
What is the ZIP+4 code for 74631?
74631 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 74631, you need to look up a specific street address to get them.
What city is 74631?
74631 is assigned to Blackwell, Oklahoma, in Kay 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.