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Buffalo, IL
Full City Profile · Illinois · Sangamon County County
3.4
/5.0
B
Good
405
Population
1,157/sq mi density
$67,321
Median Income
$37,993 per capita
$122,400
Home Value
$205,950 Zillow
$475
Median Rent
30.8% income on rent
54°F
Avg Temperature
302 sunny days/yr
576
Violent Crime/100K
1,009 property/100K
B
Overall
3.4 / 5.0
Good overall score based on economy, affordability, safety and education
A
Economy
4.1 / 5.0
$67,321 median income, 1.5% unemployment
A+
Affordability
5.0 / 5.0
$122,400 home value, $475/mo rent
F
Safety
1.0 / 5.0
576 violent crimes/100K (52% above avg)
B
Education
3.4 / 5.0
30.2% bachelor's degree or higher
Change Over Time (2013–2023)
Population Change
-12.4%
499 → 437
over 10 years
Annual Pop. Growth
-1.32%
Compound annual growth rate
Median Income Change
+68.3%
$40,000 → $67,321
nominal, not inflation-adjusted
Annual Income Growth
+5.34%
Compound annual growth rate
Population Over Time
Total population for Buffalo 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
398
-39 from 2023 (437)
Projected Median Income 2030
$96,896
+$29,575 from 2023 ($67,321)
Year-by-Year Detail
| Year | Population | YoY % | Median Income | YoY % |
|---|---|---|---|---|
| 2013 | 499 | — | $40,000 | — |
| 2015 | 493 | -1.2% | $39,000 | -2.5% |
| 2017 | 485 | -1.6% | $40,357 | +3.5% |
| 2019 | 476 | -1.9% | $42,708 | +5.8% |
| 2021 | 442 | -7.1% | $55,500 | +30% |
| 2023 | 437 | -1.1% | $67,321 | +21.3% |
Source: U.S. Census ACS 5-Year Estimates (Data Commons). Home value and rent are not yet available historically.