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St. Mary's, CO
Full City Profile · Colorado · Gilpin County County
4.1
/5.0
A
Great
130
Population
90/sq mi density
$78,854
Median Income
$38,148 per capita
$406,900
Home Value
$476,301 Zillow
42°F
Avg Temperature
330 sunny days/yr
A
Overall
4.1 / 5.0
Strong
A+
Economy
4.6 / 5.0
$78,854 median income, 0.0% unemployment
B+
Affordability
3.8 / 5.0
$406,900 home value, /mo rent
B+
Education
3.9 / 5.0
36.0% bachelor's degree or higher
Change Over Time (2013–2023)
Population Change
-0.8%
131 → 130
over 10 years
Annual Pop. Growth
-0.08%
Compound annual growth rate
Median Income Change
-5.1%
$83,125 → $78,854
nominal, not inflation-adjusted
Annual Income Growth
-0.53%
Compound annual growth rate
Population Over Time
Total population for St. Mary's 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
129
-1 from 2023 (130)
Projected Median Income 2030
$75,975
$-2,879 from 2023 ($78,854)
Year-by-Year Detail
| Year | Population | YoY % | Median Income | YoY % |
|---|---|---|---|---|
| 2013 | 131 | — | $83,125 | — |
| 2015 | 291 | +122.1% | $97,917 | +17.8% |
| 2017 | 377 | +29.6% | $88,281 | -9.8% |
| 2019 | 620 | +64.5% | $78,143 | -11.5% |
| 2021 | 267 | -56.9% | $68,750 | -12% |
| 2023 | 130 | -51.3% | $78,854 | +14.7% |
Source: U.S. Census ACS 5-Year Estimates (Data Commons). Home value and rent are not yet available historically.