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Groton, South Dakota
Location in Brown County and the state of South Dakota
Location in Brown County and the state of South Dakota
Country United States
State South Dakota
County Brown
Incorporated 1888
Area
 • Total 1.75 sq mi (4.54 km2)
 • Land 1.75 sq mi (4.54 km2)
 • Water 0.00 sq mi (0.00 km2)
Elevation
1,302 ft (397 m)
Population
 (2020)
 • Total 1,380
 • Density 842.38/sq mi (325.18/km2)
Time zone UTC−6 (Central (CST))
 • Summer (DST) UTC−5 (CDT)
ZIP code
57445
Area code(s) 605
FIPS code 46-26340
GNIS feature ID 1255377

Groton is a city in southeastern Brown County, South Dakota, United States. The population was 1,380 at the 2020 census.

History

Groton was platted in 1881. The city was named after Groton, Massachusetts. A post office has been in operation at Groton since 1881.

Geography

Groton is located at 45°27′4″N 98°5′57″W / 45.45111°N 98.09917°W / 45.45111; -98.09917 (45.451015, -98.099050).

According to the United States Census Bureau, the city has a total area of 1.75 square miles (4.53 km2), all land.

Groton has been assigned the ZIP code 57445 and the FIPS place code 26340.

Demographics

Historical population
Census Pop.
1890 684
1900 700 2.3%
1910 1,108 58.3%
1920 1,273 14.9%
1930 1,009 −20.7%
1940 946 −6.2%
1950 1,084 14.6%
1960 1,063 −1.9%
1970 1,021 −4.0%
1980 1,230 20.5%
1990 1,196 −2.8%
2000 1,356 13.4%
2010 1,458 7.5%
2020 1,380 −5.3%
U.S. Decennial Census
2017 Estimate

2010 census

As of the census of 2010, there were 1,458 people, 576 households, and 373 families living in the city. The population density was 833.1 inhabitants per square mile (321.7/km2). There were 630 housing units at an average density of 360.0 per square mile (139.0/km2). The racial makeup of the city was 97.5% White, 0.3% African American, 0.5% Native American, 0.1% Asian, 0.2% from other races, and 1.4% from two or more races. Hispanic or Latino of any race were 0.9% of the population.

There were 576 households, of which 34.4% had children under the age of 18 living with them, 56.1% were married couples living together, 6.4% had a female householder with no husband present, 2.3% had a male householder with no wife present, and 35.2% were non-families. 30.4% of all households were made up of individuals, and 15.4% had someone living alone who was 65 years of age or older. The average household size was 2.45 and the average family size was 3.13.

The median age in the city was 40 years. 28.5% of residents were under the age of 18; 5.5% were between the ages of 18 and 24; 22.9% were from 25 to 44; 23.7% were from 45 to 64; and 19.4% were 65 years of age or older. The gender makeup of the city was 49.3% male and 50.7% female.

Notable people

  • Robert A. Johnson, farmer, businessman, and South Dakota State Senator, lived in Groton.
  • Earl Sande, Hall of Fame jockey and trainer, was born in Groton.
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