All Countries
Seneca, IL
Full City Profile · Illinois · Grundy County County
3.1
/5.0
B
Good
2,525
Population
407/sq mi density
$91,065
Median Income
$42,714 per capita
$206,400
Home Value
$246,823 Zillow
$988
Median Rent
21.3% income on rent
50°F
Avg Temperature
275 sunny days/yr
649
Violent Crime/100K
2,509 property/100K
B
Overall
3.1 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
4.5 / 5.0
$91,065 median income, 2.5% unemployment
A+
Affordability
5.0 / 5.0
$206,400 home value, $988/mo rent
F
Safety
1.0 / 5.0
649 violent crimes/100K (71% above avg)
C
Education
2.0 / 5.0
12.9% bachelor's degree or higher
Change Over Time (2013–2023)
Population Change
+0.5%
2,302 → 2,313
over 10 years
Annual Pop. Growth
+0.05%
Compound annual growth rate
Median Income Change
+43.4%
$63,500 → $91,065
nominal, not inflation-adjusted
Annual Income Growth
+3.67%
Compound annual growth rate
Population Over Time
Total population for Seneca 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
2,321
+8 from 2023 (2,313)
Projected Median Income 2030
$117,199
+$26,134 from 2023 ($91,065)
Year-by-Year Detail
| Year | Population | YoY % | Median Income | YoY % |
|---|---|---|---|---|
| 2013 | 2,302 | — | $63,500 | — |
| 2015 | 2,273 | -1.3% | $61,458 | -3.2% |
| 2017 | 2,250 | -1% | $67,351 | +9.6% |
| 2019 | 2,241 | -0.4% | $72,273 | +7.3% |
| 2021 | 2,320 | +3.5% | $85,294 | +18% |
| 2023 | 2,313 | -0.3% | $91,065 | +6.8% |
Source: U.S. Census ACS 5-Year Estimates (Data Commons). Home value and rent are not yet available historically.