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Estelline is a city in Hamlin County, South Dakota, United States. It is part of the Watertown, South Dakota Micropolitan Statistical Area. The population was 768 at the 2010 census. The current mascot for Estelline High School is the Redhawks.
A post office was first established at Estelline in 1879. Estelline was platted in 1882. The city was named for a local farmer's daughter.
Estelline is located at 44°34′34″N 96°54′02″W.
According to the United States Census Bureau, the city has a total area of 0.95 square miles (2.46 km2), all of it land.
Estelline has been assigned the ZIP code 57234 and the FIPS place code 19980.
At the 2010 census there were 768 people in 297 households, including 189 families, in the city. The population density was 808.4 inhabitants per square mile (312.1/km2). There were 321 housing units at an average density of 337.9 per square mile (130.5/km2).