Milwaukie is a city mostly in Clackamas County, Oregon, United States; a very small portion of the city extends into Multnomah County. The population was 21,119 at the 2020 census. Founded in 1847 on the banks of the Willamette River, the city, known as the Dogwood City of the West, was incorporated in 1903; it is the birthplace of the Bing cherry. The city is now a suburb of Portland and also adjoins the unincorporated areas of Clackamas and Oak Grove.