St. Mary's, Colorado Demographics & Population 2026

A note before these figures: with a population of 68, St. Mary's's ACS estimates come from a small number of survey responses and carry wide margins of error. Individual percentages below — particularly rates that round to 0% or 100% — are approximations, not precise measurements. See data.census.gov for the published margins of error.

Population Overview

St. Mary's is a small community located in Colorado, within Clear Creek County. The total population is 68. It ranks as the 431st most populous out of 472 Census-designated places in Colorado.

Age Demographics

The median age in St. Mary's is 64.1 years. This is 70% higher than the state median of 37.7 years.

Economy, Income & Housing

The median household income in St. Mary's is $25,357. This is 73% lower than the state median of $95,470. It is also 69% lower than the national median of $80,734. The poverty rate stands at 54.4%. This is 476% higher than the state poverty rate of 9.4%. With more than one in five residents living below the poverty line, economic hardship is a significant challenge for the community. The survey records no unemployed residents in St. Mary's, which reflects the size of the sample rather than a labor market without joblessness. 84.5% of occupied housing units are owner-occupied. This homeownership rate is 28% higher than the state average of 66.2%.

Race & Ethnicity

Every resident counted in St. Mary's was recorded as White (non-Hispanic). A figure of exactly 100.0% reflects a survey sample too small to capture the community's full composition rather than a precise measurement.

Education

50.0% of residents aged 25 and older hold a bachelor's degree or higher. This is 9% higher than the state rate of 45.7%. Nationally, 35.7% of adults hold at least a bachelor's degree. No surveyed resident aged 25 or older reported leaving school before earning a high school diploma, though a rate of exactly 100% reflects the limits of a small sample.

Data Sources & Methodology

All demographic data for St. Mary's, Colorado is sourced from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates. The ACS collects data from approximately 3.5 million households annually and pools five years of responses so that even small communities can be measured, though the margin of error widens as the population falls. Comparisons are made against Colorado state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 472 Census-designated places in Colorado. Read more about how these figures are produced on our methodology page, or visit data.census.gov for official data.