Founded on Feb 7, 1835, DeKalb County is one of 92 counties in the state of Indiana. Historically, DeKalb County was formed from Non-county Area. The city of Auburn is the county seat. With FIPS code of 33, DeKalb County has a population of 43,333 and area of 363 square miles (940 km2).
List of all cities in DeKalb County, IN alphabetically
| City/Town | Postal Code | Area Code |
| Altona, IN | 46738 | 260 |
| Artic, IN | 46721 | 260 |
| Ashley, IN | 46705 | 260 |
| Auburn, IN | 46706 | 260 |
| Auburn Junction, IN | 46706 | 260 |
| Butler, IN | 46721 | 260 |
| Butler Center, IN | 46738 | 260 |
| Cedar Creek, IN | 46738 | 260 |
| Corunna, IN | 46730 | 260 |
| Dutch Town, IN | 46738 | 260 |
| Fairfield Center, IN | 46730 | 260 |
| Garrett, IN | 46738 | 260 |
| Indian Lake, IN | 46730 | 260 |
| Keyser, IN | 46738 | 260 |
| Moore, IN | 46721 | 260 |
| Newville, IN | 46721 | 260 |
| Norland Park, IN | 46706 | 260 |
| Saint Joe, IN | 46785 | 260 |
| Sedan, IN | 46793 | 260 |
| Steuben, IN | 46705 | 260 |
| Steubenville, IN | 46705 | 260 |
| Waterloo, IN | 46793 | 260 |