Sumner is a city in Bremer County, Iowa, United States.

[3] The Bremer County portion of Sumner is part of the Waterloo–Cedar Falls Metropolitan Statistical Area.

[4] The community is named after American political leader Charles Sumner.

Sumner is home to Life Line Emergency Vehicles, a major manufacturer of ambulances.

There were 938 housing units at an average density of 381.5 per square mile (147.3/km2).

There were 944 housing units at an average density of 374.6 per square mile (144.6/km2).

33.0% of all households were made up of individuals, and 18.3% had someone living alone who was 65 years of age or older.

There were 930 housing units at an average density of 368.2 per square mile (142.2/km2).

32.1% of all households were made up of individuals, and 20.6% had someone living alone who was 65 years of age or older.

Sumner has recently built a new library, recreation center, and a park for residents.