Founded on Feb 10, 1831, Grant County is one of 92 counties in the state of Indiana. Historically, Grant County was formed from Madison County, Adams New Purchase and un-organized. The city of Marion is the county seat. With FIPS code of 53, Grant County has a population of 66,263 and area of 414 square miles (1,072 km2).
List of all cities in Grant County, IN alphabetically
| City/Town | Postal Code | Area Code |
| Fairmount, IN | 46928 | 765 |
| Fowlerton, IN | 46930 | 765 |
| Gas City, IN | 46933 | 765 |
| Jonesboro, IN | 46938 | 765 |
| Landess, IN | 46991 | 765 |
| Marion, IN | 46952 | 765 |
| Marion, IN | 46953 | 765 |
| Matthews, IN | 46957 | 765 |
| Sims, IN | 46986 | 765 |
| Swayzee, IN | 46986 | 765 |
| Sweetser, IN | 46987 | 765 |
| Upland, IN | 46989 | 765 |
| Van Buren, IN | 46991 | 765 |