Marysville is a city in Snohomish County, Washington, United States. As the second-largest city in the county after Everett, its population was 60,020 in the 2010 U.S. census. Located on the north side of the Snohomish River delta, Marysville is part of the Seattle metropolitan area and is located 30 miles (48 km) north of Seattle. The city is oriented north–south along Interstate 5, bordering the Tulalip Indian Reservation to the west, and State Route 9 in the east.
Marysville was established in 1872 as a trading post by James P. Comeford, but was not populated by other settlers until 1883. After the town was platted in 1885, a period of growth brought new buildings and industries to Marysville. In 1891, Marysville was incorporated and welcomed the completed Great Northern Railway. Historically, the area has subsisted on lumber and agrarian products; the growth of strawberry fields in Marysville led to the city being nicknamed the "Strawberry City" in the 1920s. The city was suburbanized in the 1970s and 1980s, resulting in the replacement of older buildings and businesses with chain establishments.
Between 1980 and 2000, the population of Marysville increased five-fold. In the early 2000s, annexations of unincorporated areas to the north and east expanded the city to over 20 square miles (52 km2) and brought the population over 60,000.
The city's landscape includes Mount Pilchuck, whose 5,300-foot (1,600 m) high peak can be seen from various points in the city and appears in the city's flag and seal.