St. Helena: Demographics & People
St. Helena is home to 5,318 people, in 2,341 households. Population shrank 1.1% from 5,378 (2022) to 5,318 (2024). Median age 48.9 years. (6.0y older than Napa County; 11.0y older than California). Children under 18 are 20% of the population. Population is 66% White (non-Hispanic) and 29% Hispanic or Latino. The community is moderately diverse (Simpson index 0.42). 70% of households are family-led. County is losing 2,284 residents per year (2022-2023). County health: 29% adult obesity, 13% smoke.
- 2.3 people per household.
- 30% non-family households (singles, roommates).
Population & Trend
Population shrank 1.1% from 5,378 (2022) to 5,318 (2024). Estimated 2026 population: ~5,258 (extrapolated at -0.6%/yr trend). Census Bureau Vintage estimate: 5,179.
| Census data vintage | 2024 |
|---|---|
| Population | 138,019 people |
| Annual growth rate · Population change | -1.1% |
| Annual growth rate · Population (2022) | 5,378 |
| Annual growth rate · Population (2024) | 5,318 |
| Annual growth rate · Trend category | declining |
| Population | 5,318 people |
| Population Estimate | 5,179 |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 48.9y is 10.0 years older than the U.S. median (38.9y). Children under 18 make up 20% — below the U.S. share of ~22%.
| Age Summary · Median age | 48.9 years (vs California 37.9y) |
|---|---|
| Age Summary · Children Pct | 19.8% |
| Age Summary · Character | established |
| Population under 18 | 1,051 |
| Median age | 48.9 years (vs California 37.9y) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Race, Ethnicity & Diversity
Of 5,318 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups). The Simpson diversity index is 0.42 (0 = single group, 1 = perfectly even distribution); this is read as moderately diverse.
| White residents | 3,805 |
|---|---|
| Black residents | 36 |
| Asian residents | 76 |
| Hispanic or Latino residents | 1,385 |
| Diversity Index · Diversity index (Simpson) | 41.6% |
| Diversity Index · Diversity label | moderately diverse |
| Diversity Index · Groups counted | 4 |
| Diversity Index · Largest group share | 71.8% |
| Asian population | 1.7% |
| Black population | 0.4% |
| Hispanic or Latino population | 29.3% |
| White (non-Hispanic) population | 65.6% |
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). 2.1% are foreign-born — below the U.S. average of 13.9%. 25% have naturalized to U.S. citizenship.
| Residents born in this state | 2,323 |
|---|---|
| Residents born in another state | 1,549 |
| Share born in this state | 43.7% |
| Share born in another state | 56.3% |
| Native-born U.S. citizens | 29.1% |
| Foreign-born residents | 2.1% |
| Naturalized citizens | 25.1% |
| Total foreign-born residents | 1,457 |
| From Europe | 234 |
| From Africa | 127 |
Households & Family Composition
2,341 households. Averaging 2.3 people each — smaller than the U.S. average of 2.5. 70% are family households — above the U.S. share of ~65%. Of 1,618 families, 29% are married couples with children.
| Children under 18 | 1,016 |
|---|---|
| Total families | 1,618 |
| Married couples with children | 475 |
| Single-parent households | 30 |
| Average household size | 2.31 |
| Women who gave birth (past year) | 16.2% |
| Grandparents living with grandchildren | 8 |
| Family households | 1,626 households |
| Households that are families | 69.5% |
| Total households | 2,341 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. 6.9% moved within the county in the past year — the U.S. baseline is roughly 8–10%. The surrounding county is losing 2,284 residents per year on net (IRS migration data).
| Moved within the county (past year) | 6.9% |
|---|---|
| Migration · People moving in (annual) | 123,445 |
| Migration · People moving out (annual) | 125,729 |
| Migration · Net migration (in − out) | -2,284 |
| 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 | 335 |
|---|---|
| Disability rate | 6.2% |
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. 42 residents live in group quarters (0.8% of population).
| Living in group quarters | 42 |
|---|
Other
| Congressional District · District | 605 |
|---|---|
| Congressional District · Congress | 118th |
| Cdc Birth Rate · Fips | 6,055 |
| Cdc Birth Rate · State Fips | 6 |
| Cdc Birth Rate · County Fips | 55 |
| Cdc Birth Rate · County | Napa |
| Cdc Birth Rate · Birth Rate | 8.1% |
| Cdc Birth Rate · Lower Ci | 6.90 |
| Cdc Birth Rate · Upper Ci | 9.50 |
| Cdc Mortality · Fips | 6,055 |
| Cdc Mortality · County | Napa County |
| Cdc Mortality · Urban Rural | Small metro |
| Cdc Mortality · Total Deaths 2020 2023 | 4,657 |
| Cdc Vaccination · Fips | 6,055 |
| Cdc Vaccination · County | Napa County |
| Cdc Vaccination · Dose1 Pop Pct | 90.4% |
| Cdc Vaccination · Series Complete Pct | 81.2% |
| Cdc Vaccination · Booster Pct | 64.9% |
| Cdc Vaccination · Population 2019 | 137,744 |
| Cdc Vaccination · Metro Status | Metro |
| Family Score · Score | 4.50 |
| Family Score · Schools | 4 |
| Family Score · Childcare Centers | 5 |
| Family Score · Children Pct | 19.8% |
| Family Score · Rating | fair |
| Town Summary · Key Facts | population 5,318, declining, established, affluent, white collar |
| Town Summary · Population | 5,318 people |
| Town Summary · County | Napa County |
Sources: NCES school congressional district assignment · federal dataset cascade