7 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Lacey | 1 | 59,584 | 56,764 | 0.8% | 3,143 | 19 | City |
| Olympia | 2 | 56,602 | 55,609 | 0.29% | 3,106 | 18 | City |
| Tumwater | 3 | 28,667 | 26,143 | 1.49% | 1,616 | 18 | City |
| Yelm | 4 | 12,222 | 10,700 | 2.12% | 2,140 | 6 | City |
| Rainier | 5 | 2,566 | 2,385 | 1.18% | 1,476 | 2 | City |
| Tenino | 6 | 1,996 | 1,875 | 1.01% | 1,371 | 1 | City |
| Bucoda | 7 | 623 | 598 | 0.65% | 1,069 | 1 | Town |
Lacey is the largest city in Thurston County, with a population of 59,584.
Bucoda is the smallest city in Thurston County, with a population of 623.
There are 7 cities in Thurston County, Washington.