Below is a list of Saint John WA zip codes. For your research we have also included Saint John Area Code, Time Zone, UTC and the local Whitman County FIPS Code. Each Saint John Washington zip code has a center Longitude / Latitude point (the Saint John center is -117.583 / 47.0898). For your convenience we have also indicated if that zip code in Saint John observes Daylight Savings time. For more information on Saint John Washington you will find helpful business links and searches.