ZIP Code 58012 — Casselton, ND
58012 is a standard (street delivery) ZIP code serving Casselton, North Dakota, in Cass 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 58012 at a glance
| ZIP code | 58012 |
|---|---|
| Primary city | Casselton |
| State | North Dakota (ND) |
| County | Cass FIPS 38017 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 3,049 |
| Coordinates | 46.936390, -97.161130 |
How ZIP+4 works in 58012
The four digits after the hyphen encode a delivery segment inside 58012. 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 58012 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 58012.
| ZIP | City | Distance |
|---|---|---|
| 58059 | Mapleton, ND | 7.1 mi |
| 58004 | Amenia, ND | 7.9 mi |
| 58042 | Harwood, ND | 9.9 mi |
| 58079 | Wheatland, ND | 10 mi |
| 58006 | Arthur, ND | 11.2 mi |
| 58002 | Absaraka, ND | 11.9 mi |
| 58078 | West Fargo, ND | 12 mi |
| 58005 | Argusville, ND | 12.7 mi |
| 58021 | Davenport, ND | 14.2 mi |
| 58007 | Ayr, ND | 15.2 mi |
| 58102 | Fargo, ND | 15.6 mi |
| 58029 | Erie, ND | 16.5 mi |
Questions about 58012
What is the ZIP+4 code for 58012?
58012 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 58012, you need to look up a specific street address to get them.
What city is 58012?
58012 is assigned to Casselton, North Dakota, in Cass 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.