Westminster: Demographics & People
Census counts 115,484 people in Westminster, in 48,106 households. Population shrank 0.1% from 115,546 (2022) to 115,484 (2024). Median age 37.4 years. (3.1y younger than Jefferson County; 1.7y older than Colorado). Children under 18 are 19% of the population. Population is 64% White (non-Hispanic) and 25% Hispanic or Latino. The community is moderately diverse (Simpson index 0.43). 60% of households are family-led. County is gaining 2,834 residents per year (2022-2023). County health: 34% adult obesity, 15% smoke.
- 2.4 people per household (vs Colorado avg 2.5).
- 40% non-family households (singles, roommates) (vs Colorado 38%).
- 53 dependents per 100 working-age (youth + seniors / 18-64) (vs Colorado 58).
Population & Trend
Population shrank 0.1% from 115,546 (2022) to 115,484 (2024). Estimated 2026 population: ~115,426 (extrapolated at -0.0%/yr trend).
| Census data vintage | 2024 |
|---|---|
| Population | 519,572 people |
| Annual growth rate · Population change | -0.1% |
| Annual growth rate · Population (2022) | 115,546 |
| Annual growth rate · Population (2024) | 115,484 |
| Annual growth rate · Trend category | stable |
| Population | 115,484 people (vs Colorado 108,201) |
| Population Estimate | 115,353 |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 37.4y is 1.5 years younger than the U.S. median (38.9y). Children under 18 make up 19% — below the U.S. share of ~22%.
| Age Summary · Median age | 37.4 years (vs Colorado 35.7y) |
|---|---|
| Age Summary · Children Pct | 19.3% |
| Age Summary · Character | family-oriented |
| Age Summary · Total Pop | 115,484 |
| Age Summary · Under 18 | 22,310 |
| Age Summary · 18 To 34 | 30,929.0× |
| Age Summary · 35 To 64 | 44,740.0× |
| Age Summary · 65 Plus | 17,505 |
| Population under 18 | 22,310 |
| Median age | 37.4 years (vs Colorado 35.7y) |
Sources: Census ACS 5-Year 2024 — place-level B01001 query · Census ACS 5-Year 2023 · Refreshed 2026-04-29
Race, Ethnicity & Diversity
Of 115,484 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups). The Simpson diversity index is 0.43 (0 = single group, 1 = perfectly even distribution); this is read as moderately diverse.
| White residents | 86,308 |
|---|---|
| Black residents | 1,374 |
| Asian residents | 5,373 |
| Hispanic or Latino residents | 27,405 |
| Diversity Index · Diversity index (Simpson) | 43.3% |
| Diversity Index · Diversity label | moderately diverse |
| Diversity Index · Groups counted | 4 |
| Diversity Index · Largest group share | 71.6% |
| Asian population | 4.4% (vs Colorado 3.3%) |
| Black population | 1.1% (vs Colorado 2.0%) |
| Hispanic or Latino population | 25.4% (vs Colorado 22.6%) |
| White (non-Hispanic) population | 63.9% (vs Colorado 65.2%) |
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 (8)
Citizenship & Origin
Where residents were born and their citizenship status (Census ACS). 1.6% are foreign-born — below the U.S. average of 13.9%. 9% have naturalized to U.S. citizenship.
| Residents born in this state | 54,424 |
|---|---|
| Residents born in another state | 49,292 |
| Share born in this state | 47.1% |
| Share born in another state | 52.9% |
| Native-born U.S. citizens | 42.7% |
| Foreign-born residents | 1.6% |
| Naturalized citizens | 8.6% |
| Total foreign-born residents | 10,153 |
| From Europe | 1,250 |
| From Asia | 40 |
| From Africa | 3,729 |
Households & Family Composition
48,106 households. Averaging 2.4 people each — smaller than the U.S. average of 2.5. 60% are family households — below the U.S. share of ~65%. Of 28,957 families, 27% are married couples with children.
| Children under 18 | 22,770 |
|---|---|
| Total families | 28,957 |
| Married couples with children | 7,953 |
| Single-parent households | 1,304 |
| Average household size | 2.40 |
| Women who gave birth (past year) | 13.9% |
| Grandparents living with grandchildren | 1,723 |
| Grandparents responsible for grandchildren | 635 |
| Family households | 28,643 households (vs Colorado 26,135) |
| Households that are families | 59.5% (vs Colorado 62.3%) |
| Total households | 48,106 households (vs Colorado 42,233) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Residential Stability & Migration
How long residents have lived here and where they came from. 16.7% moved within the county in the past year — the U.S. baseline is roughly 8–10%. The surrounding county is gaining 2,834 residents per year on net (IRS migration data).
| Moved within the county (past year) | 16.7% |
|---|---|
| Migration · People moving in (annual) | 523,542 |
| Migration · People moving out (annual) | 520,708 |
| Migration · Net migration (in − out) | 2,834 |
| Migration · Population growing | Yes |
| Migration · Year | 2022-2023 |
Sources: IRS SOI Migration 2021-2022 · Refreshed 2026-04-12
Disability
Census ACS measures self-reported functional limitations — vision, hearing, mobility, cognitive, self-care, or independent-living. The U.S. baseline disability rate is about 12–13%; rates trend higher with median age.
| Residents with a disability | 5,418 |
|---|---|
| Disability rate | 4.7% |
Group Quarters
Group quarters are non-household living arrangements counted by the Census — college dormitories, nursing homes, military barracks, group homes, correctional facilities, and similar institutional or shared housing. 438 residents live in group quarters (0.4% of population).
| Living in group quarters | 438 |
|---|
Other
| Congressional District · District | 807 |
|---|---|
| Congressional District · Congress | 118th |
| Cdc Birth Rate · Fips | 08001 |
| Cdc Birth Rate · State Fips | 08 |
| Cdc Birth Rate · County Fips | 001 |
| Cdc Birth Rate · County | Adams |
| Cdc Birth Rate · Birth Rate | 18.2% |
| Cdc Birth Rate · Lower Ci | 17.20 |
| Cdc Birth Rate · Upper Ci | 19.30 |
| Cdc Mortality · Fips | 08001 |
| Cdc Mortality · County | Adams County |
| Cdc Mortality · Urban Rural | Large fringe metro |
| Cdc Mortality · Total Deaths 2020 2023 | 15,210 |
| Cdc Vaccination · Fips | 08001 |
| Cdc Vaccination · County | Adams County |
| Cdc Vaccination · Dose1 Pop Pct | 78.3% |
| Cdc Vaccination · Series Complete Pct | 71.8% |
| Cdc Vaccination · Booster Pct | 53.8% |
| Cdc Vaccination · Population 2019 | 517,421 |
| Cdc Vaccination · Metro Status | Metro |
| Family Score · Score | 10 |
| Family Score · Schools | 31 |
| Family Score · Childcare Centers | 35 |
| Family Score · Youth Sports Orgs | 2 |
| Family Score · Children Pct | 19.3% |
| Family Score · Rating | excellent |
| Town Summary · Key Facts | population 115,484, stable, family-oriented, affluent, white collar |
| Town Summary · Population | 115,484 people (vs Colorado 108,201) |
| Town Summary · County | Adams County |
Sources: NCES school congressional district assignment · federal dataset cascade