Founded in 1845, Clark County is one of 39 counties in the state of Washington. Historically, Clark County was formed from Original County. The city of Vancouver is the county seat. With FIPS code of 11, Clark County has a population of 503,311 and area of 629 square miles (1,629 km2).
List of all cities in Clark County, WA alphabetically
| City/Town | Postal Code | Area Code |
| Amboy, WA | 98601 | 360/564 |
| Battle Ground, WA | 98604 | 360/564 |
| Brush Prairie, WA | 98606 | 360/564 |
| Camas, WA | 98607 | 360/564 |
| Chelatchie, WA | 98601 | 360/564 |
| Heisson, WA | 98622 | 360/564 |
| La Center, WA | 98629 | 360/564 |
| Orchards, WA | 98662 | 360/564 |
| Ridgefield, WA | 98642 | 360/564 |
| Vancouver, WA | 98660 | 360/564 |
| 98661 | 360/564 | |
| 98662 | 360/564 | |
| 98663 | 360/564 | |
| 98664 | 360/564 | |
| 98665 | 360/564 | |
| 98666 | 360/564 | |
| 98668 | 360/564 | |
| 98682 | 360/564 | |
| 98683 | 360/564 | |
| 98684 | 360/564 | |
| 98685 | 360/564 | |
| 98686 | 360/564 | |
| 98687 | 360/564 | |
| Washougal, WA | 98671 | 360/564 |
| Yacolt, WA | 98675 | 360/564 |