11 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Lacey | 1 | 59,395 | 56,722 | 0.91% | 3,199 | 18.57 | City |
| Olympia | 2 | 55,816 | 55,608 | 0.08% | 3,063 | 18.22 | City |
| Tumwater | 3 | 27,971 | 26,140 | 1.33% | 1,576 | 17.74 | City |
| Yelm | 4 | 10,859 | 10,661 | 0.37% | 1,901 | 5.71 | City |
| Rochester | 5 | 7,256 | 4,854 | 4.69% | 857 | 8.46 | CDP |
| Tanglewilde | 6 | 6,536 | 7,033 | 0.66% | 5,032 | 1.30 | CDP |
| North Yelm | 7 | 2,755 | 3,738 | -0.36% | 833 | 3.31 | CDP |
| Rainier | 8 | 2,538 | 2,383 | 1.24% | 1,460 | 1.74 | City |
| Tenino | 9 | 1,989 | 1,873 | 1.17% | 1,366 | 1.46 | City |
| Bucoda | 10 | 627 | 597 | 0.97% | 1,075 | 0.58 | Town |
| Nisqually Indian Community | 11 | 598 | 591 | 0.34% | 196 | 3.05 | CDP |
Lacey is the largest city in Thurston County, with a population of 59,395.
Nisqually Indian Community is the smallest city in Thurston County.
There are 11 cities in Thurston County, Washington.