Sherwood is a city in Washington County, Oregon, United States. Located in the southeast corner of the county, it is a residential community in the Tualatin Valley, southwest of Portland. The population was 20,450 at the 2020 census. Sherwood was first incorporated in 1893 as a town. Originally named Smockville after its founder, James Christopher Smock, the town was given its current name by local businessman Robert Alexander in 1891.