Below is a list of Castle Rock WA zip codes. For your research we have also included Castle Rock Area Code, Time Zone, UTC and the local Cowlitz County FIPS Code. Each Castle Rock Washington zip code has a center Longitude / Latitude point (the Castle Rock center is -122.90599822998 / 46.270198822021). For your convenience we have also indicated if that zip code in Castle Rock observes Daylight Savings time.