Milbank is a city in Grant County, South Dakota, United States, located along the South Fork of the Whetstone River. The population was 3,353 at the 2010 census. It is the county seat of Grant County. In 1925 The American Legion Department of South Dakota established a new program for high school aged youth that grew into a national program. Milbank is the birthplace of American Legion Baseball, which is played in all fifty states by more than five thousand teams.
The city was founded in 1880 when the Chicago, Milwaukee and St. Paul Railway first laid rails into South Dakota, and was named in honor of railroad director Jeremiah Milbank. The city was incorporated in 1881.
Milbank is located at 45°13′7″N 96°38′1″W (45.218583, -96.633721).
According to the United States Census Bureau, the city has a total area of 2.84 square miles (7.36 km2), of which 2.76 square miles (7.15 km2) is land and 0.08 square miles (0.21 km2) is water.
Milbank has been assigned the ZIP code range 57252-57253 and the FIPS place code 42260.
As of the census of 2010, there were 3,353 people, 1,508 households, and 898 families living in the city.