Castle Rock, Washington

Castle Rock population, 2020 to 2024

Castle Rock lost 6 residents from July 2020 to July 2024, a change of -0.2%. In the latest year it moved by +3.

Castle Rock covers 2.10 square miles of land and 0.23 of water, for 1,164 people per square mile of land. The median Washington place of 5,000+ has 2,694, so Castle Rock is less dense than the typical town.

What county Castle Rock is in

All of Castle Rock's residents live in Cowlitz County, which had 113,982 residents in 2024. Castle Rock holds 2.1% of the county's population. The shaded shape is on the map above; dots mark the eight nearest places.

ZIP codes in Castle Rock

1 ZIP Code Tabulation Area (ZCTA) overlaps Castle Rock by at least 10% of the ZCTA's or the city's land: 98611. ZCTAs are Census approximations of USPS ZIP code delivery areas. The list comes from the 2020 ZCTA to place relationship file, so a city that annexed land after 2020 may reach into ZIP codes not listed here.

Where Castle Rock is

The Census internal point of Castle Rock is at 46.271900, -122.903900. Olympia, the capital, is 52.8 miles N in a straight line. The nearest larger place is Longview, WA (38,294 people), 9.2 miles away. The nearest city of 100,000 or more is Vancouver, WA, 46.3 miles away.

Daylight in Castle Rock

At 46.27° N, Castle Rock gets about 15 h 48 min of daylight around the June solstice and 8 h 36 min around the December solstice, a swing of 7 h 11 min. Figures are sunrise to sunset from the SunCalc model for June 21 and December 21, 2026.

Places near Castle Rock

The eight nearest incorporated places of 1,000+ in Washington, measured between internal points. The closest is Longview, 9.2 miles away, with 38,294 people.