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St. Peter, IL
Full City Profile · Illinois · Marion County County
3.0
/5.0
B
Good
256
Population
492/sq mi density
$55,000
Median Income
$32,242 per capita
$91,400
Home Value
$101,301 Zillow
$488
Median Rent
14.2% income on rent
55°F
Avg Temperature
293 sunny days/yr
212
Violent Crime/100K
1,059 property/100K
B
Overall
3.0 / 5.0
Good overall score based on economy, affordability, safety and education
B+
Economy
3.7 / 5.0
$55,000 median income, 0.0% unemployment
A+
Affordability
5.0 / 5.0
$91,400 home value, $488/mo rent
F
Safety
1.0 / 5.0
212 violent crimes/100K
C
Education
2.2 / 5.0
14.8% bachelor's degree or higher
Change Over Time (2013–2023)
Population Change
-11.1%
352 → 313
over 10 years
Annual Pop. Growth
-1.17%
Compound annual growth rate
Median Income Change
+51.7%
$36,250 → $55,000
nominal, not inflation-adjusted
Annual Income Growth
+4.26%
Compound annual growth rate
Population Over Time
Total population for St. Peter 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
288
-25 from 2023 (313)
Projected Median Income 2030
$73,652
+$18,652 from 2023 ($55,000)
Year-by-Year Detail
| Year | Population | YoY % | Median Income | YoY % |
|---|---|---|---|---|
| 2013 | 352 | — | $36,250 | — |
| 2015 | 349 | -0.9% | $37,813 | +4.3% |
| 2017 | 342 | -2% | $43,906 | +16.1% |
| 2019 | 339 | -0.9% | $45,938 | +4.6% |
| 2021 | 331 | -2.4% | $56,000 | +21.9% |
| 2023 | 313 | -5.4% | $55,000 | -1.8% |
Source: U.S. Census ACS 5-Year Estimates (Data Commons). Home value and rent are not yet available historically.