Washington is a U.S. state situated in the Pacific Northwest region of the United States. Olympia is the capital and Seattle is the largest city of Washington. The Evergreen State is the nickname of Washington. Washington Zip Code started with the digit 9800. The total number of WashingtonZip Code approximately 715. The total population of Washington about 6,724,540. So you can find any information about Washington especially zip codes, area codes, Populations, cities, county and so on.