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Plymouth, IL
Full City Profile · Illinois · McDonough County County
2.7
/5.0
C+
Fair
512
Population
898/sq mi density
$39,750
Median Income
$24,923 per capita
$55,500
Home Value
$104,536 Zillow
$796
Median Rent
36.3% income on rent
52°F
Avg Temperature
275 sunny days/yr
C+
Overall
2.7 / 5.0
Fair overall score based on economy, affordability, safety and education
D
Economy
1.7 / 5.0
$39,750 median income, 11.6% unemployment
A+
Affordability
5.0 / 5.0
$55,500 home value, $796/mo rent
C+
Safety
2.5 / 5.0
0 violent crimes/100K
D
Education
1.7 / 5.0
9.0% bachelor's degree or higher
Change Over Time (2013–2023)
Population Change
-13.1%
489 → 425
over 10 years
Annual Pop. Growth
-1.39%
Compound annual growth rate
Median Income Change
+46%
$27,222 → $39,750
nominal, not inflation-adjusted
Annual Income Growth
+3.86%
Compound annual growth rate
Population Over Time
Total population for Plymouth across each available Census ACS release.
Median Household Income Over Time
Median household income reported by U.S. Census ACS. Values are nominal (not adjusted for inflation).
Projected 2030
Simple projections extrapolating the 2013–2023 compound annual growth rate forward. These are mathematical extensions of recent trends, not forecasts — real outcomes depend on migration, policy and economic shifts.
Projected Population 2030
385
-40 from 2023 (425)
Projected Median Income 2030
$51,817
+$12,067 from 2023 ($39,750)
Year-by-Year Detail
| Year | Population | YoY % | Median Income | YoY % |
|---|---|---|---|---|
| 2013 | 489 | — | $27,222 | — |
| 2015 | 481 | -1.6% | $38,173 | +40.2% |
| 2017 | 473 | -1.7% | $36,771 | -3.7% |
| 2019 | 466 | -1.5% | $38,750 | +5.4% |
| 2021 | 433 | -7.1% | $46,250 | +19.4% |
| 2023 | 425 | -1.8% | $39,750 | -14.1% |
Source: U.S. Census ACS 5-Year Estimates (Data Commons). Home value and rent are not yet available historically.