Keizer is a city located in Marion County, Oregon, United States, along the 45th parallel. As of the 2010 United States Census, its population was 36,478. It lies in the Willamette Valley and is part of the Salem Metropolitan Statistical Area. The city of Keizer offers several facilities for recreation, as Keizer Rapids Park, Chalmer Jones Park and Willamette Manor are all located within the city. The Keizer Heritage Museum provides insight into the history of the area. The McNary Golf Club is popular among local golfers as well.