Founded on Jan 8, 1823, Hamilton County is one of 92 counties in the state of Indiana. Historically, Hamilton County was formed from Delaware New Purchase. The city of Noblesville is the county seat. With FIPS code of 57, Hamilton County has a population of 356,650 and area of 394 square miles (1,020 km2).
List of all cities in Hamilton County, IN alphabetically
| City/Town | Postal Code | Area Code |
| Arcadia, IN | 46030 | 765 |
| Aroma, IN | 46031 | 765 |
| Atlanta, IN | 46031 | 765 |
| Carmel, IN | 46032 | 317 |
| 46033 | 317 | |
| 46082 | 317 | |
| Cicero, IN | 46034 | 317 |
| East Union, IN | 46031 | 765 |
| Ekin, IN | 46031 | 765 |
| Fishers, IN | 46037 | 317 |
| 46038 | 317 | |
| 46085 | 317 | |
| Indianapolis, IN | 46280 | 317 |
| 46290 | 317 | |
| Newgistics Merchandise Retrn, IN | 46085 | 317 |
| Noblesville, IN | 46060 | 317 |
| 46061 | 317 | |
| 46062 | 317 | |
| Nora, IN | 46280 | 317 |
| 46290 | 317 | |
| Sheridan, IN | 46069 | 317 |
| Strawtown, IN | 46060 | 317 |
| Westfield, IN | 46074 | 317 |