Stanwood is a city in Cedar County, Iowa, United States. The population was 637 at the time of the 2020 census. Stanwood was platted in 18…Stanwood is a city in Cedar County, Iowa, United States. The population was 637 at the time of the 2020 census. Stanwood was platted in 1868. The first house was built in Stanwood in 1869. The city was named for H. P. Stanwood, a railroad official.