Washington Township is a township in Story County, Iowa, United States. As of the 2000 census, its population was 35,477. Washington Township covers an area of 35.1 square miles and contains the incorporated town of Ames, as well as part of Kelley. According to the USGS, it contains five cemeteries: Ontario Cemetery, Ames Municipal Cemetery, Memorial …Washington Township is a township in Story County, Iowa, United States. As of the 2000 census, its population was 35,477. Washington Township covers an area of 35.1 square miles and contains the incorporated town of Ames, as well as part of Kelley. According to the USGS, it contains five cemeteries: Ontario Cemetery, Ames Municipal Cemetery, Memorial Gardens Cemetery, College Cemetery and Sunday Cemetery.