All Countries
Quincy, IL
Full City Profile · Illinois · Adams County County
3.2
/5.0
B
Good
39,188
Population
2,462/sq mi density
$56,372
Median Income
$34,819 per capita
$146,100
Home Value
$173,925 Zillow
$824
Median Rent
26.6% income on rent
54°F
Avg Temperature
302 sunny days/yr
608
Violent Crime/100K
3,028 property/100K
B
Overall
3.2 / 5.0
Good overall score based on economy, affordability, safety and education
B+
Economy
3.8 / 5.0
$56,372 median income, 2.7% unemployment
A+
Affordability
5.0 / 5.0
$146,100 home value, $824/mo rent
F
Safety
1.0 / 5.0
608 violent crimes/100K (60% above avg)
B
Education
3.1 / 5.0
26.6% bachelor's degree or higher
Change Over Time (2013–2023)
Population Change
-4.5%
40,781 → 38,959
over 10 years
Annual Pop. Growth
-0.46%
Compound annual growth rate
Median Income Change
+38.2%
$40,790 → $56,372
nominal, not inflation-adjusted
Annual Income Growth
+3.29%
Compound annual growth rate
Population Over Time
Total population for Quincy 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
37,722
-1,237 from 2023 (38,959)
Projected Median Income 2030
$70,708
+$14,336 from 2023 ($56,372)
Year-by-Year Detail
| Year | Population | YoY % | Median Income | YoY % |
|---|---|---|---|---|
| 2013 | 40,781 | — | $40,790 | — |
| 2015 | 40,707 | -0.2% | $40,850 | +0.1% |
| 2017 | 40,290 | -1% | $42,854 | +4.9% |
| 2019 | 39,936 | -0.9% | $46,189 | +7.8% |
| 2021 | 39,131 | -2% | $50,857 | +10.1% |
| 2023 | 38,959 | -0.4% | $56,372 | +10.8% |
Source: U.S. Census ACS 5-Year Estimates (Data Commons). Home value and rent are not yet available historically.