| Zip Code | City | Population ↓ |
|---|---|---|
| 58075 | Wahpeton | 9,046 |
| 58053 | Lidgerwood | 1,409 |
| 58041 | Hankinson | 1,389 |
| 58081 | Wyndmere | 876 |
| 58077 | Walcott | 684 |
| 58030 | Fairmount | 593 |
| 58018 | Colfax | 428 |
| 58076 | Wahpeton | 427 |
| 58061 | Mooreton | 369 |
| 58015 | Christine | 343 |
| 58001 | Abercrombie | 232 |
| 58057 | Mcleod | 226 |
| 58008 | Barney | 188 |
| 58058 | Mantador | 115 |
| 58074 | Wahpeton | 63 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 15 ZCTAs in Richland County, North Dakota (US Census).