18 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Fayetteville | 1 | 106,278 | 94,783 | 2.21% | 1,941 | 54.76 | City |
| Springdale | 2 | 88,825 | 87,322 | 0.34% | 1,785 | 49.77 | City |
| Farmington | 3 | 11,189 | 7,619 | 6.82% | 1,139 | 9.83 | City |
| Tontitown | 4 | 9,139 | 4,701 | 10.76% | 510 | 17.91 | City |
| Prairie Grove | 5 | 8,887 | 7,134 | 4.11% | 953 | 9.33 | City |
| Elkins | 6 | 4,057 | 3,637 | 2.11% | 1,047 | 3.87 | City |
| Johnson | 7 | 3,712 | 3,611 | 0.54% | 1,027 | 3.61 | City |
| Elm Springs | 8 | 3,146 | 2,398 | 5.01% | 529 | 5.95 | City |
| Goshen | 9 | 2,421 | 2,115 | 2.58% | 214 | 11.31 | Town |
| Lincoln | 10 | 2,401 | 2,286 | 0.97% | 838 | 2.87 | City |
| West Fork | 11 | 2,371 | 2,326 | 0.38% | 635 | 3.73 | City |
| Greenland | 12 | 1,224 | 1,214 | 0.16% | 305 | 4.01 | City |
| Cincinnati | 13 | 774 | 462 | 7.2% | 103 | 7.48 | CDP |
| Morrow | 14 | 438 | 378 | 7.35% | 153 | 2.87 | CDP |
| Summers | 15 | 428 | 147 | 7.27% | 176 | 2.44 | CDP |
| Winslow | 16 | 362 | 364 | 0% | 199 | 1.82 | City |
| Canehill | 17 | 112 | 217 | 6.67% | 51 | 2.18 | CDP |
| Evansville | 18 | 93 | 21 | 8.14% | 64 | 1.44 | CDP |
Fayetteville is the largest city in Washington County, with a population of 106,278.
Evansville is the smallest city in Washington County.
There are 18 cities in Washington County, Arkansas.