Below is a list of Grand Coulee WA zip codes. For your research we have also included Grand Coulee Area Code, Time Zone, UTC and the local Grant County FIPS Code. Each Grand Coulee Washington zip code has a center Longitude / Latitude point (the Grand Coulee center is -119.00399780273 / 47.941501617432). For your convenience we have also indicated if that zip code in Grand Coulee observes Daylight Savings time.