| Zip Code | City | Population ↓ |
|---|---|---|
| 46953 | Marion | 23,372 |
| 46952 | Marion | 18,189 |
| 46933 | Gas City | 6,536 |
| 46989 | Upland | 5,385 |
| 46928 | Fairmount | 4,553 |
| 46938 | Jonesboro | 2,494 |
| 46919 | Converse | 1,968 |
| 46986 | Swayzee | 1,617 |
| 46991 | Van Buren | 1,594 |
| 46987 | Sweetser | 1,055 |
| 46957 | Matthews | 443 |
| 46930 | Fowlerton | 185 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 12 ZCTAs in Grant County, Indiana (US Census).