7 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Johnson City | 1 | 74,814 | 71,121 | 1% | 1,719 | 43.51 | City |
| Jonesborough | 2 | 6,858 | 5,913 | 2.83% | 1,288 | 5.32 | Town |
| Oak Grove | 3 | 4,421 | 4,353 | -0.02% | 976 | 4.53 | CDP |
| Spurgeon | 4 | 4,018 | 4,426 | 0.1% | 983 | 4.09 | CDP |
| Gray | 5 | 1,290 | 1,342 | 0.39% | 868 | 1.49 | CDP |
| Telford | 6 | 1,010 | 990 | 0.6% | 409 | 2.47 | CDP |
| Fall Branch | 7 | 907 | 1,180 | -2.79% | 201 | 4.52 | CDP |
Johnson City is the largest city in Washington County, with a population of 74,814.
Fall Branch is the smallest city in Washington County.
There are 7 cities in Washington County, Tennessee.