Delmont is a city in Douglas County, South Dakota, United States. The population was 234 at the 2010 census.
Delmont is located at 43°16′1″N 98°9′47″W / 43.26694°N 98.16306°W / 43.26694; -98.16306 (43.267013, -98.162996).
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.
Delmont has been assigned the ZIP code 57330 and the FIPS place code 16060.
As of the census of 2010, there were 234 people, 110 households, and 61 families residing in the city. The population density was 307.9 inhabitants per square mile (118.9/km). There were 141 housing units at an average density of 185.5 per square mile (71.6/km). The racial makeup of the city was 83.3% White, 3.0% African American, 9.0% Native American, 1.7% from other races, and 3.0% from two or more races. Hispanic or Latino of any race were 3.4% of the population.
There were 110 households of which 22.7% had children under the age of 18 living with them, 46.4% were married couples living together, 5.5% had a female householder with no husband present, 3.6% had a male householder with no wife present, and 44.5% were non-families. 37.3% of all households were made up of individuals and 19.1% had someone living alone who was 65 years of age or older. The average household size was 2.13 and the average family size was 2.87.
The median age in the city was 50.7 years. 20.5% of residents were under the age of 18; 6.4% were between the ages of 18 and 24; 15.8% were from 25 to 44; 34.2% were from 45 to 64; and 23.1% were 65 years of age or older. The gender makeup of the city was 53.4% male and 46.6% female.
As of the census of 2000, there were 263 people, 114 households, and 68 families residing in the city. The population density was 345.7 people per square mile (133.6/km²). There were 133 housing units at an average density of 174.8 per square mile (67.6/km²). The racial makeup of the city was 91.63% White, 7.60% Native American, 0.38% Asian, and 0.38% from two or more races. Hispanic or Latino of any race were 0.76% of the population.
There were 114 households out of which 26.3% had children under the age of 18 living with them, 50.9% were married couples living together, 6.1% had a female householder with no husband present, and 39.5% were non-families. 35.1% of all households were made up of individuals and 18.4% had someone living alone who was 65 years of age or older. The average household size was 2.31 and the average family size was 3.04.
In the city, the population was spread out with 25.1% under the age of 18, 6.1% from 18 to 24, 22.8% from 25 to 44, 24.3% from 45 to 64, and 21.7% who were 65 years of age or older. The median age was 43 years. For every 100 females, there were 90.6 males. For every 100 females age 18 and over, there were 89.4 males.
The median income for a household in the city was $23,750, and the median income for a family was $33,000. Males had a median income of $24,583 versus $16,667 for females. The per capita income for the city was $12,385. About 18.2% of families and 19.6% of the population were below the poverty line, including 20.7% of those under the age of eighteen and 17.5% of those 65 or over.
Delmont 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