Plankinton is a city in and county seat of Aurora County, South Dakota, United States. The population was 707 at the 2010 census.
Plankinton is located at 43°43′N 98°29′W / 43.717°N 98.483°W / 43.717; -98.483 (43.7148, -98.4832).
According to the United States Census Bureau, the city has a total area of 0.76 square miles (1.97 km), all of it land.
Plankinton has been assigned the ZIP code 57368 and the FIPS place code 50020.
As of the census of 2010, there were 707 people, 294 households, and 191 families residing in the city. The population density was 930.3 inhabitants per square mile (359.2/km). There were 341 housing units at an average density of 448.7 per square mile (173.2/km). The racial makeup of the city was 92.8% White, 0.7% African American, 0.4% Native American, 5.8% from other races, and 0.3% from two or more races. Hispanic or Latino of any race were 10.2% of the population.
There were 294 households of which 30.6% had children under the age of 18 living with them, 50.7% were married couples living together, 10.2% had a female householder with no husband present, 4.1% had a male householder with no wife present, and 35.0% were non-families. 29.9% of all households were made up of individuals and 13.3% had someone living alone who was 65 years of age or older. The average household size was 2.40 and the average family size was 2.99.
The median age in the city was 38.6 years. 26.2% of residents were under the age of 18; 4.7% were between the ages of 18 and 24; 26.3% were from 25 to 44; 25.5% were from 45 to 64; and 17.3% were 65 years of age or older. The gender makeup of the city was 49.6% male and 50.4% female.
As of the census of 2000, there were 601 people, 265 households, and 170 families residing in the city. The population density was 920.6 people per square mile (357.0/km²). There were 298 housing units at an average density of 456.5 per square mile (177.0/km²). The racial makeup of the city was 94.51% White, 0.17% Native American, 0.17% Asian, 3.99% from other races, and 1.16% from two or more races. Hispanic or Latino of any race were 5.99% of the population.
There were 265 households out of which 25.3% had children under the age of 18 living with them, 53.2% were married couples living together, 7.5% had a female householder with no husband present, and 35.5% were non-families. 34.3% of all households were made up of individuals and 20.4% had someone living alone who was 65 years of age or older. The average household size was 2.27 and the average family size was 2.89.
In the city, the population was spread out with 22.1% under the age of 18, 8.0% from 18 to 24, 23.1% from 25 to 44, 26.0% from 45 to 64, and 20.8% who were 65 years of age or older. The median age was 42 years. For every 100 females, there were 95.8 males. For every 100 females age 18 and over, there were 91.0 males.
The median income for a household in the city was $32,019, and the median income for a family was $40,809. Males had a median income of $26,645 versus $19,531 for females. The per capita income for the city was $15,611. About 3.5% of families and 6.2% of the population were below the poverty line, including 5.1% of those under age 18 and 6.8% of those age 65 or over.
Plankinton South Dakota neighborhoods include: Alcester, Baltic, Black Hawk, Box Elder, Brandon, Buffalo Ridge, Camp Crook, Canton, Caputa, Central City, Chancellor, Colton, Creighton, Crooks, Custer, Deadwood, Dell Rapids, Elkton, Ellsworth Afb, Garretson, Hartford, Hermosa, Hill City, Howes, Humboldt, Keystone, Lead, Ludlow, Montrose, Nemo, New Underwood, North Sioux City, Owanka, Parker, Quinn, Rapid City, Renner, Rowena, Saint Onge, Scenic, Sherman, Silver City, Sioux Falls, Spearfish, Sturgis, Valley Springs, Wall, Wanblee, Wasta, Whitewood