Home > WA > Cowlitz County > Castle Rock > Zip 98611

Zip Code 98611 — Castle Rock, WA

98611 is a ZIP Code associated with Castle Rock, WA, located within Cowlitz. The postal region supports an estimated population of 9,302 residents across Data Pending housing units, with a population density of 26.4 people per square mile.
WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (46.306420, -122.904790)

Data MetricLocal Statistic
Postal / Zip Code98611
Primary CityCastle Rock
State / ProvinceWA
CountyCowlitz
Total Population9,302
Median Household IncomeData Pending
Total Housing UnitsData Pending
Population Density26.4 people/sq mi
TimezoneAmerica/Los_Angeles

How 98611 Compares

MetricZIP 98611Cowlitz CountyWA State Average
Population9,302116,8407,816,021
Median IncomeData PendingN/AN/A
Population Density26.4 /sq mi----

Nearby ZIP Codes

ZIP CodeCityDistancePopulationMedian Income
Zip 98645Silverlake6.1 mi2,216N/A
Zip 98593Vader8.6 mi1,541N/A
Zip 98581Ryderwood8.6 mi419N/A
Zip 98632Longview10.2 mi50,635N/A
Zip 98626Kelso12.0 mi26,892N/A

Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →