| Official Name: | La Plant, South Dakota |
| Settlement Type: | Census-designated place |
| Mapsize: | 250px |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | South Dakota |
| Subdivision Type2: | County |
| Subdivision Name2: | Dewey |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Km2: | 24.57 |
| Area Land Km2: | 24.48 |
| Area Water Km2: | 0.10 |
| Area Total Sq Mi: | 9.49 |
| Area Land Sq Mi: | 9.45 |
| Area Water Sq Mi: | 0.04 |
| Population As Of: | 2020 |
| Population Footnotes: | [2] |
| Population Total: | 167 |
| Population Density Km2: | 6.82 |
| Population Density Sq Mi: | 17.67 |
| Timezone: | Mountain (MST) |
| Utc Offset: | -7 |
| Timezone Dst: | MDT |
| Utc Offset Dst: | -6 |
| Coordinates: | 45.1381°N -100.6647°W |
| Elevation Ft: | 2041 |
| Postal Code Type: | ZIP code |
| Postal Code: | 57652 |
| Area Code: | 605 |
| Blank Name: | FIPS code |
| Blank Info: | 46-35940[3] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2393074 |
La Plant is a census-designated place (CDP) in Dewey County, South Dakota, United States. The population was 167 at the 2020 census.[4] It is within the Cheyenne River Indian Reservation.
La Plant was laid out in 1910, and named in honor of a local cattleman.[5]
La Plant is located in east-central Dewey County and U.S. Route 212 passes through the community, leading west to Eagle Butte and east to Gettysburg. The Missouri River (Lake Oahe) is to the east, and Pierre, the state capital, is to the southeast.
According to the United States Census Bureau, the CDP has a total area of 24.6km2, of which 24.5km2 is land and 0.1km2, or 0.40%, is water.[6]
As of the census of 2000, there were 150 people, 34 households, and 29 families residing in the CDP. The population density was 16.6 people per square mile (6.4/km2). There were 42 housing units at an average density of 4.7/sq mi (1.8/km2). The racial makeup of the CDP was 100.00% Native American.
There were 34 households, out of which 58.8% had children under the age of 18 living with them, 41.2% were married couples living together, 35.3% had a female householder with no husband present, and 11.8% were non-families. 11.8% of all households were made up of individuals, and 5.9% had someone living alone who was 65 years of age or older. The average household size was 4.41 and the average family size was 4.73.
In the CDP, the population was spread out, with 45.3% under the age of 18, 13.3% from 18 to 24, 22.7% from 25 to 44, 14.7% from 45 to 64, and 4.0% who were 65 years of age or older. The median age was 19 years. For every 100 females, there were 105.5 males. For every 100 females age 18 and over, there were 95.2 males.
The median income for a household in the CDP was $18,194, and the median income for a family was $18,333. Males had a median income of $41,042 versus $7,250 for females. The per capita income for the CDP was $6,888. There were 62.5% of families and 61.6% of the population living below the poverty line, including 48.5% of those under 18 and 56.3% of those over 64.
It is in Eagle Butte School District 20-1,[7] which jointly operates Cheyenne-Eagle Butte School with the Bureau of Indian Education (BIE).[8]