CDP in Butte County, South Dakota · 1.6 sq mi · 318 people per sq mi
About 510 people live in Mountain Plains. The typical household earns $248,558, and the median resident is 63.4 years old.
2026 projection
From 394 in 2020
Poverty rate 0%
Men 63.6 · Women 60.7
2020–2026
507
2026 projection
28.7% since 2020 (increase)
Source: U.S. Census Bureau decennial counts and annual estimates. 2026 is a projection. Values between recorded years are interpolated.
Use the left and right arrow keys to inspect population observations.
2020–2026
507
2026 projection
28.7% since 2020 (increase)
Source: U.S. Census Bureau decennial counts and annual estimates. 2026 is a projection. Values between recorded years are interpolated.
Use the left and right arrow keys to inspect population observations.
| 2026 | 507 | +32 | 6.74% |
|---|---|---|---|
| 2025 | 475 | +63 | 7.37% |
| 2023 | 412 | -69 | 14.35% |
| 2022 | 481 | +187 | 63.61% |
| 2021 | 294 | -100 | 25.38% |
| 2020 | 394 | — | — |
Showing 6 of 6 years.
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S0101
Each square is about 1% of residents (roughly 4 people).
Hispanic or Latino residents can be of any race. All other groups exclude Hispanic residents.
U.S. Census Bureau, 2024 ACS 5-year estimates · Table B03002
Half of households earn more, half earn less
Typical yearly pay for a worker 25 or older.
0% of residents
73% of residents age 15 and older are married.
| Status | Overall | Male | Female |
|---|---|---|---|
| Married | 73% | 80% | 67% |
| Never married | 19% | 12% | 28% |
| Divorced | 4% | 8% | 0% |
| Widowed | 3% | 0% | 6% |
| Separated | 0% | 0% | 0% |
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201
10 sources, all from the U.S. Census Bureau