Millbrook Colony is a Hutterite colony[4] and census-designated place (CDP) in Hanson County, South Dakota, United States.

[5] It was first listed as a CDP prior to the 2020 census.

[2] It is in the western part of the county, 7 miles (11 km) by road west-northwest of Alexandria, the county seat, and 10 miles (16 km) east-southeast of Mitchell.

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