| Zip Code | City | Population ↓ |
|---|---|---|
| 53818 | Platteville | 15,712 |
| 53813 | Lancaster | 6,211 |
| 53805 | Boscobel | 5,613 |
| 53809 | Fennimore | 4,721 |
| 53807 | Cuba City | 4,315 |
| 53811 | Hazel Green | 3,197 |
| 53573 | Muscoda | 3,038 |
| 53820 | Potosi | 2,314 |
| 53806 | Cassville | 1,604 |
| 53804 | Bloomington | 1,346 |
| 53801 | Bagley | 1,034 |
| 53554 | Livingston | 983 |
| 53808 | Dickeyville | 936 |
| 53569 | Montfort | 907 |
| 53816 | Mount Hope | 905 |
| 53825 | Stitzer | 468 |
| 53827 | Woodman | 361 |
| 53810 | Glen Haven | 316 |
| 53812 | Kieler | 311 |
| 53817 | Patch Grove | 225 |
| 53802 | Beetown | 134 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 21 ZCTAs in Grant County, Wisconsin (US Census).