Marysville is a city in Snohomish County, Washington, United States, part of the Seattle metropolitan area. The city is located 35 miles (56 km) north of Seattle, adjacent to Everett on the north side of the Snohomish River delta. It is the second-largest city in Snohomish County after Everett, with a population of 70,714 at the time of the 2020 U.S. census. As of 2015, Marysville was also the fastest-growing city in Washington state, growing at an annual rate of 2.5 percent.

Everett is the county seat and most populous city of Snohomish County, Washington, United States. It is 25 miles (40 km) north of Seattle and is one of the main cities in the metropolitan area and the Puget Sound region. Everett is the seventh-most populous city in the state by population, with 110,629 residents as of the 2020 census. The city is primarily situated on a peninsula at the mouth of the Snohomish River along Port Gardner Bay, an inlet of Possession Sound, and extends to the south and west.