St. Mary's: Demographics & People
68 people call St. Mary's home, in 58 households. Population shrank 47.7% from 130 (2022) to 68 (2024). Median age 64.1 years. (15.0y older than Clear Creek County; 26.2y older than Colorado). Population is 100% White (non-Hispanic). The community is relatively homogeneous (Simpson index 0.00). 26% of households are family-led. County is losing 53 residents per year (2022-2023). County health: 26% adult obesity, 12% smoke.
- 1.2 people per household.
- 74% non-family households (singles, roommates).
Population & Trend
Population shrank 47.7% from 130 (2022) to 68 (2024). Estimated 2026 population: ~39 (extrapolated at -23.8%/yr trend). Census Bureau Vintage estimate: 14.
| Census data vintage | 2024 |
|---|---|
| Population | 9,397 people |
| Annual growth rate · Population change | -47.7% |
| Annual growth rate · Population (2022) | 130 |
| Annual growth rate · Population (2024) | 68 |
| Annual growth rate · Trend category | shrinking |
| Population | 68 people |
| Population Estimate | 14 |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 64.1y is 25.2 years older than the U.S. median (38.9y).
| Age Summary · Median age | 64.1 years (vs Colorado 37.9y) |
|---|---|
| Age Summary · Character | retirement community |
| Median age | 64.1 years (vs Colorado 37.9y) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Race, Ethnicity & Diversity
Of 68 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups). The Simpson diversity index is 0.00 (0 = single group, 1 = perfectly even distribution); this is read as relatively homogeneous.
| White residents | 130 |
|---|---|
| Diversity Index · Diversity label | relatively homogeneous |
| Diversity Index · Groups counted | 1 |
| Diversity Index · Largest group share | 100.0% |
| White (non-Hispanic) population | 100.0% |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Ancestry
Self-reported ancestry from Census ACS — what residents report as their ethnic origin, separate from race. Counts can exceed population because people can list multiple ancestries.
Top (2)
Citizenship & Origin
Where residents were born and their citizenship status (Census ACS).
| Residents born in another state | 68 |
|---|---|
| Native-born U.S. citizens | 100.0% |
| Total foreign-born residents | 419 |
Households & Family Composition
58 households. Averaging 1.9 people each — smaller than the U.S. average of 2.5. 26% are family households — below the U.S. share of ~65%. Of 22 families, 100% are married couples with children.
| Children under 18 | 41 |
|---|---|
| Total families | 22 |
| Married couples with children | 22 |
| Average household size | 1.88 |
| Grandparents living with grandchildren | 8 |
| Family households | 15 households |
| Households that are families | 25.9% |
| Total households | 58 households |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Residential Stability & Migration
How long residents have lived here and where they came from. 11.8% moved within the county in the past year — the U.S. baseline is roughly 8–10%. The surrounding county is losing 53 residents per year on net (IRS migration data).
| Lived in same home a year ago | 68.0% |
|---|---|
| Moved within the county (past year) | 11.8% |
| Migration · People moving in (annual) | 8,722 |
| Migration · People moving out (annual) | 8,775 |
| Migration · Net migration (in − out) | -53 |
| Migration · Year | 2022-2023 |
Sources: IRS SOI Migration 2021-2022 · Refreshed 2026-04-12
Other
| Congressional District · District | 2 |
|---|---|
| Congressional District · Formatted | CO-02 |
| Congressional District · Congress | 118th |
| Cdc Birth Rate · Fips | 8,019 |
| Cdc Birth Rate · State Fips | 8 |
| Cdc Birth Rate · County Fips | 19 |
| Cdc Birth Rate · County | Clear Creek |
| Cdc Birth Rate · Birth Rate | 8.7% |
| Cdc Birth Rate · Lower Ci | 4.60 |
| Cdc Birth Rate · Upper Ci | 14.90 |
| Cdc Mortality · Fips | 8,019 |
| Cdc Mortality · County | Clear Creek County |
| Cdc Mortality · Urban Rural | Large fringe metro |
| Cdc Mortality · Total Deaths 2020 2023 | 179 |
| Cdc Vaccination · Fips | 8,019 |
| Cdc Vaccination · County | Clear Creek County |
| Cdc Vaccination · Dose1 Pop Pct | 57.5% |
| Cdc Vaccination · Series Complete Pct | 51.1% |
| Cdc Vaccination · Booster Pct | 58.7% |
| Cdc Vaccination · Population 2019 | 9,700 |
| Cdc Vaccination · Metro Status | Metro |
| Family Score · Score | 2.00 |
| Family Score · Schools | 2 |
| Family Score · Rating | limited |
| Town Summary · Key Facts | population 68, shrinking, retirement community, lower-income, white collar |
| Town Summary · Population | 68 people |
| Town Summary · County | Clear Creek County |
Sources: Census place-to-CD118 crosswalk (place_fips) · federal dataset cascade