Everett, WA. Online Offers. Everett is the county seat of and the largest city in Snohomish County, Washington, United States. Named for Everett Colby, son of founder Charles L. Colby, it lies 25 miles (40 km) north of Seattle. The city had a total population of 103,019 at the 2010 census, making it the 6th largest in the state and fourth-largest in the Puget Sound area. It received an All-America City Award in 2002. Everett is home to the largest public marina on the west coast of the United States and is the western terminus of the western segment of U.S. Route 2.