St. Ann Highlands: Demographics & People
St. Ann Highlands's population stands at 453 people, in 179 households. Population shrank 6.2% from 483 (2022) to 453 (2024). Median age 38.1 years. Children under 18 are 28% of the population. Population is 100% White (non-Hispanic). The community is relatively homogeneous (Simpson index 0.00). 59% of households are family-led. County is losing 4,788 residents per year (2022-2023). County health: 19% adult obesity, 10% smoke.
- 2.5 people per household.
- 41% non-family households (singles, roommates).
Population & Trend
Population shrank 6.2% from 483 (2022) to 453 (2024). Estimated 2026 population: ~425 (extrapolated at -3.1%/yr trend). Census Bureau Vintage estimate: 390.
| Census data vintage | 2024 |
|---|---|
| Population | 330,758 people |
| Annual growth rate · Population change | -6.2% |
| Annual growth rate · Population (2022) | 483 |
| Annual growth rate · Population (2024) | 453 |
| Annual growth rate · Trend category | shrinking |
| Population | 453 people |
| Population Estimate | 390 |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 38.1y is 0.8 years younger than the U.S. median (38.9y). Children under 18 make up 28% — above the U.S. share of ~22%.
| Age Summary · Median age | 38.1 years (at Colorado median) |
|---|---|
| Age Summary · Children Pct | 28.0% |
| Age Summary · Character | family-oriented |
| Population under 18 | 127 |
| Median age | 38.1 years (at Colorado median) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Race, Ethnicity & Diversity
Of 453 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 | 483 |
|---|---|
| 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 (6)
Citizenship & Origin
Where residents were born and their citizenship status (Census ACS).
| Residents born in this state | 167 |
|---|---|
| Residents born in another state | 277 |
| Share born in this state | 36.9% |
| Share born in another state | 63.1% |
| Native-born U.S. citizens | 61.1% |
| Naturalized citizens | 2.0% |
| Total foreign-born residents | 44 |
| From Europe | 37 |
Households & Family Composition
179 households. Averaging 2.6 people each — matches the U.S. average of 2.5. 59% are family households — below the U.S. share of ~65%. Of 102 families, 63% are married couples with children.
| Children under 18 | 114 |
|---|---|
| Total families | 102 |
| Married couples with children | 64 |
| Average household size | 2.56 |
| Grandparents living with grandchildren | 1,748 |
| Grandparents responsible for grandchildren | 884 |
| Family households | 105 households |
| Households that are families | 58.7% |
| Total households | 179 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. 20.8% moved within the county in the past year — the U.S. baseline is roughly 8–10%. The surrounding county is losing 4,788 residents per year on net (IRS migration data).
| Moved within the county (past year) | 20.8% |
|---|---|
| Migration · People moving in (annual) | 303,289 |
| Migration · People moving out (annual) | 308,077 |
| Migration · Net migration (in − out) | -4,788 |
| 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 | 8,013 |
| Cdc Birth Rate · State Fips | 8 |
| Cdc Birth Rate · County Fips | 13 |
| Cdc Birth Rate · County | Boulder |
| Cdc Birth Rate · Birth Rate | 5.3% |
| Cdc Birth Rate · Lower Ci | 4.70 |
| Cdc Birth Rate · Upper Ci | 6.00 |
| Cdc Mortality · Fips | 8,013 |
| Cdc Mortality · County | Boulder County |
| Cdc Mortality · Urban Rural | Medium metro |
| Cdc Mortality · Total Deaths 2020 2023 | 9,039 |
| Cdc Vaccination · Fips | 8,013 |
| Cdc Vaccination · County | Boulder County |
| Cdc Vaccination · Dose1 Pop Pct | 91.1% |
| Cdc Vaccination · Series Complete Pct | 82.8% |
| Cdc Vaccination · Booster Pct | 69.1% |
| Cdc Vaccination · Population 2019 | 326,196 |
| Cdc Vaccination · Metro Status | Metro |
| Family Score · Score | 10 |
| Family Score · Schools | 20 |
| Family Score · Children Pct | 28.0% |
| Family Score · Rating | excellent |
| Town Summary · Key Facts | population 453, shrinking, family-oriented, affluent, white collar |
| Town Summary · Population | 453 people |
| Town Summary · County | Boulder County |
Sources: Census place-to-CD118 crosswalk (place_fips) · federal dataset cascade