| Zip Code | City | Population ↓ |
|---|---|---|
| 98531 | Centralia | 26,931 |
| 98532 | Chehalis | 26,624 |
| 98596 | Winlock | 7,483 |
| 98570 | Onalaska | 4,417 |
| 98591 | Toledo | 3,667 |
| 98564 | Mossyrock | 3,106 |
| 98377 | Randle | 2,392 |
| 98356 | Morton | 2,367 |
| 98593 | Vader | 1,449 |
| 98572 | Pe Ell | 778 |
| 98355 | Mineral | 749 |
| 98542 | Ethel | 708 |
| 98533 | Cinebar | 630 |
| 98336 | Glenoma | 594 |
| 98585 | Silver Creek | 580 |
| 98565 | Napavine | 432 |
| 98361 | Packwood | 420 |
| 98538 | Curtis | 397 |
| 98582 | Salkum | 236 |
| 98539 | Doty | 159 |
| 98544 | Galvin | 7 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 21 ZCTAs in Lewis County, Washington (US Census).