Castle Rock, WA ZIP code
The ZIP code for Castle Rock, Washington is 98611. It is in Cowlitz County.
- Population in these ZIPs
- 9,302
- Avg. median income
- $86,300population-weighted
- Typical home value
- $475,900population-weighted
- Metro area
- Longview-Kelso, WA
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Castle Rock, WA ZIP code list
| ZIP code | Population | Median income | Typical home value |
|---|---|---|---|
| 98611 | 9,302 | $86,322 | $475,900 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities near Castle Rock
Frequently asked questions
What is the ZIP code for Castle Rock, WA?
The ZIP code for Castle Rock, WA is 98611.
What county is Castle Rock, Washington in?
Castle Rock ZIP codes are in Cowlitz County.