8 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 37601 | Johnson City | 38,223 |
| 37604 | Johnson City | 37,090 |
| 37659 | Jonesborough | 28,040 |
| 37615 | Johnson City | 22,268 |
| 37681 | Limestone | 6,122 |
| 37690 | Telford | 4,966 |
| 37656 | Fall Branch | 3,652 |
| 37614 | Johnson City | 2,632 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 8 ZCTAs in Washington County, Tennessee (US Census).