ZIP Code 58640 — Killdeer, ND
58640 is a standard (street delivery) ZIP code serving Killdeer, North Dakota, in Dunn 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 58640 at a glance
| ZIP code | 58640 |
|---|---|
| Primary city | Killdeer |
| State | North Dakota (ND) |
| County | Dunn FIPS 38025 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Denver |
| Population | 1,369 |
| Coordinates | 47.444090, -102.896810 |
How ZIP+4 works in 58640
The four digits after the hyphen encode a delivery segment inside 58640. 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 58640 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 58640.
| ZIP | City | Distance |
|---|---|---|
| 58626 | Dunn Center, ND | 14.3 mi |
| 58642 | Manning, ND | 17 mi |
| 58634 | Grassy Butte, ND | 21.5 mi |
| 58757 | Mandaree, ND | 22.9 mi |
| 58627 | Fairfield, ND | 23.6 mi |
| 58636 | Halliday, ND | 25.6 mi |
| 58854 | Watford City, ND | 28.2 mi |
| 58847 | Keene, ND | 30.8 mi |
| 58644 | Marshall, ND | 32.7 mi |
| 58835 | Arnegard, ND | 32.7 mi |
| 58656 | Taylor, ND | 39.4 mi |
Questions about 58640
What is the ZIP+4 code for 58640?
58640 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 58640, you need to look up a specific street address to get them.
What city is 58640?
58640 is assigned to Killdeer, North Dakota, in Dunn 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.