Snohomish is a city in Snohomish County, Washington, United States. The population was 10,126 at the 2020 census. It is located on the Snohomish River, southeast of Everett and northwest of Monroe. Snohomish lies at the intersection of U.S. Route 2 and State Route 9. The city's airport, Harvey Airfield, is located south of downtown and used primarily for general aviation. The city was founded in 1859 and named Cadyville after pioneer settler E. F. Cady and renamed to Snohomish in 1871.