Sheridan is a city in Yamhill County, Oregon, United States. Platted in the 1860s when it received a post office, the city was incorporated in 1880. A major fire burned much of the city in 1913, and a flood covered much of the city in 1964. The population of the city as of the 2020 Census was 6,233, an increase from 6,127 at the 2010 census. Located in the western part of the Willamette Valley, the city is at the base of the Northern Oregon Coast Range along the South Yamhill River.