Below is a list of Kelso WA zip codes. For your research we have also included Kelso Area Code, Time Zone, UTC and the local Cowlitz County FIPS Code. Each Kelso Washington zip code has a center Longitude / Latitude point (the Kelso center is -122.88999938965 / 46.124500274658). For your convenience we have also indicated if that zip code in Kelso observes Daylight Savings time.