Alger is a census-designated place (CDP) in Skagit County, Washington, United States. The population was 403 at the 2010 census. It is included in the Mount Vernon–Anacortes, Washington Metropolitan Statistical Area.
Alger is located along Old Highway 99 North Road. A former logging camp, Alger is now a working-class exurban community and home to the Skagit Speedway. The nearby Skagit Speedway has been operating for 50 years and attracting racers from all over the Northwest and West. It is a 1/3 mile banked oval track built of silica and clay, and the faster classes of sprint cars achieve lap averages of almost 100 mph. Races are typically held on Saturday nights under floodlights, and camping is available for racers and spectators in the Speedway's grounds.