Identifiers: city · CDP · town
| Rank | Community | Population |
|---|---|---|
| 1 | Tumwater (city), WA | 25,350 |
| 2 | Centralia (city), WA | 18,183 |
| 3 | Chehalis (city), WA | 7,439 |
| 4 | Rochester (CDP), WA | 6,064 |
| 5 | Grand Mound (CDP), WA | 3,301 |
| 6 | Castle Rock (city), WA | 2,446 |
| 7 | Fords Prairie (CDP), WA | 2,234 |
| 8 | Napavine (city), WA | 1,888 |
| 9 | Tenino (city), WA | 1,870 |
| 10 | Winlock (city), WA | 1,472 |
| 11 | Oakville (city), WA | 715 |
| 12 | Onalaska (CDP), WA | 657 |
| 13 | Pe Ell (town), WA | 642 |
| 14 | Toledo (city), WA | 631 |
| 15 | Vader (city), WA | 629 |
| 16 | Bucoda (town), WA | 600 |