9 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Aberdeen | 1 | 17,047 | 17,037 | 0.01% | 1,568 | 11 | City |
| Hoquiam | 2 | 8,764 | 8,784 | -0.03% | 918 | 10 | City |
| Ocean Shores | 3 | 8,209 | 6,774 | 3% | 964 | 9 | City |
| Montesano | 4 | 4,212 | 4,158 | 0.21% | 386 | 11 | City |
| Elma | 5 | 3,547 | 3,451 | 0.45% | 1,283 | 3 | City |
| Westport | 6 | 2,400 | 2,222 | 1.27% | 653 | 4 | City |
| McCleary | 7 | 2,080 | 2,017 | 0.53% | 1,015 | 2 | City |
| Cosmopolis | 8 | 1,677 | 1,634 | 0.42% | 1,205 | 1 | City |
| Oakville | 9 | 742 | 721 | 0.54% | 1,344 | 1 | City |
Aberdeen is the largest city in Grays Harbor County, with a population of 17,047.
Oakville is the smallest city in Grays Harbor County, with a population of 742.
There are 9 cities in Grays Harbor County, Washington.