Founded in 1823, Dyer County is one of 95 counties in the state of Tennessee. Historically, Dyer County was formed from Indian lands. The city of Dyersburg is the county seat. With FIPS code of 45, Dyer County has a population of 36,615 and area of 510 square miles (1,321 km2).
List of all cities in Dyer County, TN alphabetically
| City/Town | Postal Code | Area Code |
| Bogota, TN | 38007 | 731 |
| Dyersburg, TN | 38024 | 731 |
| 38025 | 731 | |
| Finley, TN | 38030 | 731 |
| Lenox, TN | 38047 | 731 |
| Newbern, TN | 38059 | 731 |
| Tigrett, TN | 38070 | 731 |
| Trimble, TN | 38259 | 731 |