La Plant
- County:
- Dewey County
- County Seat:
- No
- Area (mi²):
- 9.45
- State:
- South Dakota
La Plant is a CDP located in Dewey County, South Dakota. La Plant has a 2025 population of 332. La Plant is currently growing at a rate of 3.11% annually and its population has increased by 8.85% since the most recent census, which recorded a population of 305 in 2020.
The average household income in La Plant is $22,117 with a poverty rate of 96.88%.The median age in La Plant is 18.3 years: 5.6 years for males, and 30.5 years for females.