City in Marshall County, Indiana · 7.6 sq mi · 1,491 people per sq mi
11,287 people live in Plymouth. The typical household earns $58,623, and the median resident is 37.7 years old.
2026 projection
From 10,214 in 2020
Poverty rate 13.48%
Men 33 · Women 40.9
1860–2026
11,287
2026 projection
10.5% since 2020 (increase)
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.
1860–2026
11,287
2026 projection
10.5% since 2020 (increase)
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 | 11,287 | +206 | 1.86% |
|---|---|---|---|
| 2025 | 11,081 | +55 | 0.50% |
| 2024 | 11,026 | +110 | 1.01% |
| 2023 | 10,916 | +272 | 2.56% |
| 2022 | 10,644 | +278 | 2.68% |
| 2021 | 10,366 | +152 | 1.49% |
| 2020 | 10,214 | +1 | 0.01% |
| 2019 | 10,213 | -11 | 0.11% |
| 2018 | 10,224 | -1 | 0.01% |
| 2017 | 10,225 | -30 | 0.29% |
Showing 10 of 32 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.
Plymouth is growing faster than Marshall County, Indiana, 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 107 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 7 residents
37% of residents age 15 and older are married.
| Status | Overall | Male | Female |
|---|---|---|---|
| Married | 37% | 39% | 35% |
| Never married | 37% | 44% | 29% |
| Divorced | 16% | 13% | 18% |
| Widowed | 8% | 2% | 14% |
| Separated | 3% | 2% | 3% |
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201
14 sources