| 37614 East TN State University | 423 | Washington County | Tennessee (TN) |
| 37614 Etsu | 423 | Washington County | Tennessee (TN) |
| 37656 Fall Branch | 423 | Washington County | Tennessee (TN) |
| 37615 Gray | 423 | Washington County | Tennessee (TN) |
| 37601 JC | 423 | Washington County | Tennessee (TN) |
| 37602 JC | 423 | Washington County | Tennessee (TN) |
| 37604 JC | 423 | Washington County | Tennessee (TN) |
| 37605 JC | 423 | Washington County | Tennessee (TN) |
| 37614 JC | 423 | Washington County | Tennessee (TN) |
| 37615 JC | 423 | Washington County | Tennessee (TN) |
| 37601 Johnson City | 423 | Washington County | Tennessee (TN) |
| 37602 Johnson City | 423 | Washington County | Tennessee (TN) |
| 37604 Johnson City | 423 | Washington County | Tennessee (TN) |
| 37605 Johnson City | 423 | Washington County | Tennessee (TN) |
| 37614 Johnson City | 423 | Washington County | Tennessee (TN) |
| 37615 Johnson City | 423 | Washington County | Tennessee (TN) |
| 37659 Jonesboro | 423 | Washington County | Tennessee (TN) |
| 37659 Jonesborough | 423 | Washington County | Tennessee (TN) |
| 37681 Limestone | 423 | Washington County | Tennessee (TN) |
| 37684 Mountain Home | 423 | Washington County | Tennessee (TN) |
| 37684 Mtn Home | 423 | Washington County | Tennessee (TN) |
| 37690 Telford | 423 | Washington County | Tennessee (TN) |