7 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Lacey | 1 | 59,114 | 56,764 | 0.8% | 3,119 | 19 | City |
| Olympia | 2 | 56,436 | 55,609 | 0.29% | 3,097 | 18 | City |
| Tumwater | 3 | 28,246 | 26,143 | 1.51% | 1,592 | 18 | City |
| Yelm | 4 | 11,968 | 10,700 | 2.16% | 2,096 | 6 | City |
| Rainier | 5 | 2,536 | 2,385 | 1.2% | 1,459 | 2 | City |
| Tenino | 6 | 1,976 | 1,875 | 1.02% | 1,357 | 1 | City |
| Bucoda | 7 | 619 | 598 | 0.65% | 1,062 | 1 | Town |
Lacey is the largest city in Thurston County, with a population of 59,114.
Bucoda is the smallest city in Thurston County, with a population of 619.
There are 7 cities in Thurston County, Washington.