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St. Marys, IA
Full City Profile · Iowa · Warren County County
3.3
/5.0
B
Good
112
Population
800/sq mi density
$78,750
Median Income
$45,503 per capita
$168,800
Home Value
$212,840 Zillow
$1,300
Median Rent
23.0% income on rent
50°F
Avg Temperature
275 sunny days/yr
527
Violent Crime/100K
2,312 property/100K
B
Overall
3.3 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
4.5 / 5.0
$78,750 median income, 0.0% unemployment
A+
Affordability
5.0 / 5.0
$168,800 home value, $1,300/mo rent
F
Safety
1.0 / 5.0
527 violent crimes/100K (39% above avg)
C+
Education
2.9 / 5.0
23.2% bachelor's degree or higher
Change Over Time (2013–2023)
Population Change
-11%
127 → 113
over 10 years
Annual Pop. Growth
-1.16%
Compound annual growth rate
Median Income Change
+23.5%
$63,750 → $78,750
nominal, not inflation-adjusted
Annual Income Growth
+2.14%
Compound annual growth rate
Population Over Time
Total population for St. Marys 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
104
-9 from 2023 (113)
Projected Median Income 2030
$91,332
+$12,582 from 2023 ($78,750)
Year-by-Year Detail
| Year | Population | YoY % | Median Income | YoY % |
|---|---|---|---|---|
| 2013 | 127 | — | $63,750 | — |
| 2015 | 127 | +0% | $73,750 | +15.7% |
| 2017 | 124 | -2.4% | $81,641 | +10.7% |
| 2019 | 127 | +2.4% | $69,271 | -15.2% |
| 2021 | 107 | -15.7% | $58,125 | -16.1% |
| 2023 | 113 | +5.6% | $78,750 | +35.5% |
Source: U.S. Census ACS 5-Year Estimates (Data Commons). Home value and rent are not yet available historically.