New Effington is a town in Roberts County, South Dakota, United States. The population was 256 at the 2010 census.
New Effington was laid out in 1913, after a proposed railroad further away from the original city Effington spurred the need to move the town. Needing a new name they simply added "New", the original being a reference to one of the first women (named Ellie) to get a homestead in the original town.
New Effington is located at 45°51′22″N 96°55′9″W (45.856135, -96.919074).
According to the United States Census Bureau, the town has a total area of 0.27 square miles (0.70 km2), of which 0.26 square miles (0.67 km2) is land and 0.01 square miles (0.03 km2) is water.
New Effington has been assigned the ZIP code 57255 and the FIPS place code 44860.
As of the census of 2010, there were 256 people, 107 households, and 65 families residing in the town. The population density was 984.6 inhabitants per square mile (380.2/km2). There were 121 housing units at an average density of 465.4 per square mile (179.7/km2). The racial makeup of the town was 57.8% White, 0.4% African American, 36.3% Native American, 0.8% from other races, and 4.7% from two or more races. Hispanic or Latino of any race were 0.8% of the population.
There were 107 households, of which 29.9% had children under the age of 18 living with them, 42.1% were married couples living together, 14.0% had a female householder with no husband present, 4.7% had a male householder with no wife present, and 39.3% were non-families.