10 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 57252 | Milbank | 4,883 |
| 57216 | Big Stone City | 1,584 |
| 57266 | Summit | 626 |
| 57259 | Revillo | 477 |
| 57256 | Ortley | 238 |
| 57251 | Marvin | 228 |
| 57265 | Strandburg | 202 |
| 57264 | Stockholm | 191 |
| 57269 | Twin Brooks | 186 |
| 57246 | Labolt | 132 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 10 ZCTAs in Grant County, South Dakota (US Census).