Founded in 1845, Lewis County is one of 39 counties in the state of Washington. Historically, Lewis County was formed from Clark County. The city of Chehalis is the county seat. With FIPS code of 41, Lewis County has a population of 82,149 and area of 2,403 square miles (6,224 km2).
List of all cities in Lewis County, WA alphabetically
| City/Town | Postal Code | Area Code |
| Adna, WA | 98522 | 360/564 |
| Ajlune, WA | 98564 | 360/564 |
| Alpha, WA | 98570 | 360/564 |
| Boistfort, WA | 98532 | 360/564 |
| Bunker, WA | 98532 | 360/564 |
| Carlson, WA | 98355 | 360/564 |
| Carriage Hill, WA | 98336 | 360/564 |
| Centralia, WA | 98531 | 360/564 |
| Ceres, WA | 98532 | 360/564 |
| Chehalis, WA | 98532 | 360/564 |
| Cinebar, WA | 98533 | 360/564 |
| Claquato, WA | 98532 | 360/564 |
| Curtis, WA | 98538 | 360/564 |
| Doty, WA | 98539 | 360/564 |
| Dryad, WA | 98532 | 360/564 |
| Ethel, WA | 98542 | 360/564 |
| Evaline, WA | 98596 | 360/564 |
| Fords Prairie, WA | 98531 | 360/564 |
| Forest, WA | 98532 | 360/564 |
| Galvin, WA | 98544 | 360/564 |
| Glenoma, WA | 98336 | 360/564 |
| Grand Mound, WA | 98531 | 360/564 |
| Guerrier, WA | 98532 | 360/564 |
| Harmony, WA | 98585 | 360/564 |
| Kalber, WA | 98538 | 360/564 |
| Klaber, WA | 98538 | 360/564 |
| Knab, WA | 98591 | 360/564 |
| Kosmos, WA | 98336 | 360/564 |
| Lacamas, WA | 98570 | 360/564 |
| Lindberg, WA | 98356 | 360/564 |
| Littell, WA | 98532 | 360/564 |
| Marys Corner, WA | 98532 | 360/564 |
| Mineral, WA | 98355 | 360/564 |
| Morton, WA | 98356 | 360/564 |
| Mossyrock, WA | 98564 | 360/564 |
| Napavine, WA | 98532 | 360/564 |
| 98565 | 360/564 | |
| Newaukum, WA | 98532 | 360/564 |
| Onalaska, WA | 98570 | 360/564 |
| Packwood, WA | 98361 | 360/564 |
| Pe Ell, WA | 98572 | 360/564 |
| Peell, WA | 98572 | 360/564 |
| Randle, WA | 98377 | 360/564 |
| Saint Urbans, WA | 98596 | 360/564 |
| Salkum, WA | 98582 | 360/564 |
| Silver Creek, WA | 98585 | 360/564 |
| Toledo, WA | 98591 | 360/564 |
| Vader, WA | 98593 | 360/564 |
| Waunch Prairie, WA | 98531 | 360/564 |
| Wildwood, WA | 98538 | 360/564 |
| Winlock, WA | 98596 | 360/564 |