14 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Salem | 1 | 6,416 | 6,556 | -0.36% | 1,519 | 4 | City |
| Salem | 2 | 4,103 | 3,971 | 0.42% | 117 | 35 | Township |
| Polk | 3 | 2,755 | 2,683 | 0.66% | 77 | 36 | Township |
| Pierce | 4 | 2,551 | 2,493 | 0.67% | 72 | 36 | Township |
| Salem | 5 | 2,162 | 2,138 | 0% | 64 | 34 | Township |
| Jackson | 6 | 2,082 | 2,048 | 0.58% | 82 | 25 | Township |
| Posey | 7 | 1,865 | 1,829 | 0.54% | 56 | 34 | Township |
| Salem | 8 | 1,261 | 1,299 | -0.47% | 35 | 36 | Township |
| Howard | 9 | 1,234 | 1,219 | 0.49% | 34 | 36 | Township |
| Gibson | 10 | 1,153 | 1,121 | 0.7% | 23 | 51 | Township |
| Brown | 11 | 1,112 | 1,079 | 0.72% | 36 | 31 | Township |
| Jefferson | 12 | 878 | 850 | 0.8% | 18 | 48 | Township |
| Campbellsburg | 13 | 542 | 533 | 0.37% | 546 | 1 | Town |
| Little York | 14 | 192 | 189 | 0.52% | 196 | 1 | Town |
Salem is the largest city in Washington County, with a population of 6,416.
Little York is the smallest city in Washington County, with a population of 192.
There are 14 cities in Washington County, Indiana.