ZIP Code 98611 – Castle Rock, WA
Castle Rock, Washington · Cowlitz County · Pacific time
| ZIP code | 98611 |
|---|---|
| City | Castle Rock |
| State | Washington |
| County | Cowlitz County |
| Population | 9,302 |
| Time zone | Pacific · local time |
| ZIP type | Standard (has a Census ZCTA area) |
| Land area | 136.12 sq mi |
| Center (lat, long) | 46.3051, -122.9007 |
Area codes in this area
These are the area codes that most often serve ZIP 98611 (including overlays). The exact area code depends on the phone number — landlines, mobiles and overlays can differ even on the same street.
Map
Nearby ZIP codes
About ZIP 98611
ZIP code 98611 is assigned to Castle Rock, Washington. It lies in Cowlitz County. Its Census area covers about 136.12 square miles of land. The closest neighboring ZIP is 98645 (Silverlake), about 7 miles away.
Every address in 98611 also has a 4-digit add-on code (ZIP+4) that points to a smaller delivery area. Use the box above to find it.
Sources: US Census Bureau (ZCTA, county relationship files), GeoNames (CC BY 4.0), NANPA via NumberResearch.org (CC BY 4.0). Map © OpenStreetMap contributors. ZIP areas are approximate. Population: U.S. Census Bureau, ACS 5-year estimates, 2024 (ZCTA). Data sources