California: Demographics & People
Census counts 13,136 people in California, in 5,294 households. Population shrank 0.7% from 13,223 (2022) to 13,136 (2024). Median age 35.0 years. (2.2y younger than St. Mary's County; 4.3y younger than Maryland). Children under 18 are 22% of the population. Population is 57% White (non-Hispanic) and 22% Black. The community is moderately diverse (Simpson index 0.54). 63% of households are family-led. County health: 35% adult obesity, 13% smoke.
- 2.5 people per household.
- 37% non-family households (singles, roommates).
Population & Trend
Population shrank 0.7% from 13,223 (2022) to 13,136 (2024). Estimated 2026 population: ~13,049 (extrapolated at -0.3%/yr trend). Census Bureau Vintage estimate: 12,934.
| Census data vintage | 2024 |
|---|---|
| Population | 113,777 people |
| Annual growth rate · Population change | -0.7% |
| Annual growth rate · Population (2022) | 13,223 |
| Annual growth rate · Population (2024) | 13,136 |
| Annual growth rate · Trend category | stable |
| Population | 13,136 people |
| Population Estimate | 12,934 |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 35.0y is 3.9 years younger than the U.S. median (38.9y). Children under 18 make up 22% — near the U.S. share of ~22%.
| Age Summary · Median age | 35.0 years (vs Maryland 39.3y) |
|---|---|
| Age Summary · Children Pct | 22.2% |
| Age Summary · Character | family-oriented |
| Population under 18 | 2,920 |
| Median age | 35.0 years (vs Maryland 39.3y) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Race, Ethnicity & Diversity
Of 13,136 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups). The Simpson diversity index is 0.54 (0 = single group, 1 = perfectly even distribution); this is read as moderately diverse.
| White residents | 7,822 |
|---|---|
| Black residents | 2,967 |
| Asian residents | 523 |
| Hispanic or Latino residents | 1,217 |
| Diversity Index · Diversity index (Simpson) | 54.3% |
| Diversity Index · Diversity label | moderately diverse |
| Diversity Index · Groups counted | 4 |
| Diversity Index · Largest group share | 62.4% |
| Asian population | 4.3% |
| Black population | 22.2% |
| Hispanic or Latino population | 9.0% |
| White (non-Hispanic) population | 57.4% |
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). 1.4% are foreign-born — below the U.S. average of 13.9%. 6% have naturalized to U.S. citizenship.
| Residents born in this state | 4,625 |
|---|---|
| Residents born in another state | 7,490 |
| Share born in this state | 35.2% |
| Share born in another state | 64.8% |
| Native-born U.S. citizens | 57.0% |
| Foreign-born residents | 1.4% |
| Naturalized citizens | 6.4% |
| Total foreign-born residents | 923 |
| From Europe | 72 |
| From Africa | 259 |
| From Latin America | 9 |
Households & Family Composition
5,294 households. Averaging 2.6 people each — matches the U.S. average of 2.5. 63% are family households — below the U.S. share of ~65%. Of 3,354 families, 34% are married couples with children.
| Children under 18 | 3,094 |
|---|---|
| Total families | 3,354 |
| Married couples with children | 1,127 |
| Single-parent households | 185 |
| Average household size | 2.57 |
| Women who gave birth (past year) | 10.1% |
| Grandparents living with grandchildren | 71 |
| Grandparents responsible for grandchildren | 17 |
| Family households | 3,327 households |
| Households that are families | 62.8% |
| Total households | 5,294 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. 13.9% moved within the county in the past year — the U.S. baseline is roughly 8–10%.
| Moved within the county (past year) | 13.9% |
|---|---|
| Migration · People moving in (annual) | 112,262 |
| Migration · People moving out (annual) | 112,232 |
| Migration · Net migration (in − out) | 30 |
| 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 | 499 |
|---|---|
| Disability rate | 3.7% |
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. 38 residents live in group quarters (0.3% of population).
| Living in group quarters | 38 |
|---|
Other
| Congressional District · District | 5 |
|---|---|
| Congressional District · Congress | 118th |
| Cdc Birth Rate · Fips | 24,037 |
| Cdc Birth Rate · State Fips | 24 |
| Cdc Birth Rate · County Fips | 37 |
| Cdc Birth Rate · County | St Marys |
| Cdc Birth Rate · Birth Rate | 10.7% |
| Cdc Birth Rate · Lower Ci | 9.20 |
| Cdc Birth Rate · Upper Ci | 12.30 |
| Cdc Mortality · Fips | 24,037 |
| Cdc Mortality · County | St. Mary's County |
| Cdc Mortality · Urban Rural | Small metro |
| Cdc Mortality · Total Deaths 2020 2023 | 3,099 |
| Cdc Vaccination · Fips | 24,037 |
| Cdc Vaccination · County | St. Mary's County |
| Cdc Vaccination · Dose1 Pop Pct | 77.8% |
| Cdc Vaccination · Series Complete Pct | 68.9% |
| Cdc Vaccination · Booster Pct | 51.5% |
| Cdc Vaccination · Population 2019 | 113,510 |
| Cdc Vaccination · Metro Status | Metro |
| Family Score · Score | 5.10 |
| Family Score · Schools | 1 |
| Family Score · Childcare Centers | 7 |
| Family Score · Youth Sports Orgs | 3 |
| Family Score · Children Pct | 22.2% |
| Family Score · Rating | good |
| Town Summary · Key Facts | population 13,136, stable, family-oriented, affluent, white collar |
| Town Summary · Population | 13,136 people |
| Town Summary · County | St. Mary's County |
Sources: NCES school congressional district assignment · federal dataset cascade