[2] It is part of the Cedar Rapids, Iowa metropolitan area.

Walker began as an outgrowth of the Burlington, Cedar Rapids and Northern Railway.

It was named in honor of W. W. Walker, chief engineer of the railroad.

[4] As of the census of 2020,[6] there were 688 people, 278 households, and 185 families residing in the city.

As of the census[7] of 2010, there were 791 people, 289 households, and 215 families living in the city.

21.1% of all households were made up of individuals, and 12.5% had someone living alone who was 65 years of age or older.

As of the census[8] of 2000, there were 750 people, 273 households, and 197 families living in the city.

22.7% of all households were made up of individuals, and 13.2% had someone living alone who was 65 years of age or older.

[9] Just north of Walker was Cono Christian School, an international boarding school, founded by Max Belz in 1948, now used as a summer camp and retreat center.