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Flandreau, South Dakota
"The Heart Of South Dakota"
Location in Moody County and the state of South Dakota
Location in Moody County and the state of South Dakota
Country United States
State South Dakota
County Moody
Incorporated 1902
 • Total 1.93 sq mi (4.99 km2)
 • Land 1.86 sq mi (4.81 km2)
 • Water 0.07 sq mi (0.17 km2)
1,565 ft (477 m)
 • Total 2,372
 • Density 1,245.83/sq mi (481.09/km2)
Time zone UTC−6 (Central (CST))
 • Summer (DST) UTC−5 (CDT)
ZIP code
Area code(s) 605
FIPS code 46-21540
GNIS feature ID 1255073

Flandreau FLAN-droo is a city in and county seat of Moody County, South Dakota, United States. The population was 2,372 at the 2020 census. It was named in honor of Charles Eugene Flandrau, a judge in the territory and state of Minnesota. He is credited with saving the community of New Ulm, Minnesota, from destruction during the conflict with the Sioux tribe in 1862.


Flandreau is located at 44°2′52″N 96°35′47″W / 44.04778°N 96.59639°W / 44.04778; -96.59639 (44.047855, −96.596417), along the Big Sioux River.

According to the United States Census Bureau, the city has a total area of 1.93 square miles (5.00 km2), of which, 1.86 square miles (4.82 km2) is land and 0.07 square miles (0.18 km2) is water.

Flandreau has been assigned the ZIP code 57028 and the FIPS place code 21540.


Historical population
Census Pop.
1880 471
1890 569 20.8%
1900 1,244 118.6%
1910 1,484 19.3%
1920 1,929 30.0%
1930 1,934 0.3%
1940 2,212 14.4%
1950 2,193 −0.9%
1960 2,129 −2.9%
1970 2,027 −4.8%
1980 2,114 4.3%
1990 2,311 9.3%
2000 2,376 2.8%
2010 2,341 −1.5%
2020 2,372 1.3%
U.S. Decennial Census

2010 census

As of the census of 2010, there were 2,341 people, 973 households, and 583 families living in the city. The population density was 1,258.6 inhabitants per square mile (485.9/km2). There were 1,091 housing units at an average density of 586.6 per square mile (226.5/km2). The racial makeup of the city was 64.2% White, 0.5% African American, 27.7% Native American, 2.3% Asian, 1.5% from other races, and 3.8% from two or more races. Hispanic or Latino of any race were 3.5% of the population.

There were 973 households, of which 29.4% had children under the age of 18 living with them, 39.6% were married couples living together, 12.8% had a female householder with no husband present, 7.5% had a male householder with no wife present, and 40.1% were non-families. 34.5% of all households were made up of individuals, and 15.8% had someone living alone who was 65 years of age or older. The average household size was 2.35 and the average family size was 3.00.

The median age in the city was 38.4 years. 25.9% of residents were under the age of 18; 8.2% were between the ages of 18 and 24; 22.3% were from 25 to 44; 25.1% were from 45 to 64; and 18.6% were 65 years of age or older. The gender makeup of the city was 47.3% male and 52.7% female.

Early history

The British established a Hudson's Bay Company trading post in 1763 near present-day Flandreau.

Flandreau SD 1883
1883 illustration of Flandreau

The town of Flandreau, or possibly Flandrau, was originally settled in 1857, and named for U.S Indian Agent Charles E. Flandrau. The settlement, like others in the region was abandoned within a year, as a result of threatening activities of the Yankton Sioux. In 1869, the town was resettled by twenty-five families of Christianized Sioux from the Santee reservation. White settlement resumed in 1872. When Moody County was organized in 1873, Flandreau was made the county seat. Richard F. Pettigrew of Sioux Falls, a relative of Pettigrew settlers in Flandreau, made the establishment of an Indian School at Flandreau part of his successful 1889 campaign for the U.S. Senate; the Riggs Institute was opened in 1892 and is today known as the Flandreau Indian School.


Flandreau School District 50-3 is the local public school district operated by the state.

Flandreau Indian School is in the area.

Notable people

  • Gene Amdahl (1922-2015), computer architect known for Amdahl's Law
  • Roger W. Hunt (1938-2018), South Dakota legislator
  • Bill Janklow (1939-2012), politician, South Dakota Attorney General, 4-term Governor, and 1-term member of US House of Representatives
  • Dell L. Dailey, American military officer
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