City in Brown County, South Dakota · 1.8 sq mi · 758 people per sq mi
1,327 people live in Groton. The typical household earns $89,861, and the median resident is 33.9 years old.
2026 projection
From 1,380 in 2020
Poverty rate 4.35%
Men 34.1 · Women 32.9
2010–2026
1,327
2026 projection
3.8% since 2020 (decrease)
Source: U.S. Census Bureau decennial counts and annual estimates, including 2010–2020 intercensal estimates. 2026 is a projection. Values between recorded years are interpolated.
Use the left and right arrow keys to inspect population observations.
2010–2026
1,327
2026 projection
3.8% since 2020 (decrease)
Source: U.S. Census Bureau decennial counts and annual estimates, including 2010–2020 intercensal estimates. 2026 is a projection. Values between recorded years are interpolated.
Use the left and right arrow keys to inspect population observations.
| 2026 | 1,327 | -10 | 0.75% |
|---|---|---|---|
| 2025 | 1,337 | -7 | 0.52% |
| 2024 | 1,344 | -5 | 0.37% |
| 2023 | 1,349 | -26 | 1.89% |
| 2022 | 1,375 | -6 | 0.43% |
| 2021 | 1,381 | +1 | 0.07% |
| 2020 | 1,380 | -17 | 1.22% |
| 2019 | 1,397 | -23 | 1.62% |
| 2018 | 1,420 | -28 | 1.93% |
| 2017 | 1,448 | +6 | 0.42% |
Showing 10 of 17 years.
The 2020 row compares the April 1 Census count with the July 1, 2019 estimate (about nine months). Its Growth and Annual change therefore do not represent a full year.
Groton has a population change lower than Brown County, South Dakota, and the U.S.
Change from July 1, 2020 to July 1, 2025 population estimates—not annualized growth or site projections.
Source: U.S. Census Bureau. U.S. totals are summed from the 50 states and D.C.; unavailable comparisons are omitted.
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S0101
Each square is about 1% of residents (roughly 17 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.
About 1 in 23 residents
66% of residents age 15 and older are married.
| Status | Overall | Male | Female |
|---|---|---|---|
| Married | 66% | 67% | 65% |
| Never married | 19% | 20% | 19% |
| Divorced | 9% | 11% | 6% |
| Widowed | 6% | 2% | 9% |
| Separated | <1% | 0% | <1% |
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201
14 sources