Tall Timbers: Demographics & People
Census counts 391 people in Tall Timbers, in 175 households. Population shrank 26.5% from 532 (2022) to 391 (2024). Median age 61.7 years. (24.5y older than St. Mary's County; 22.4y older than Maryland). Children under 18 are 12% of the population. Population is 93% White (non-Hispanic) and 6% Asian. The community is relatively homogeneous (Simpson index 0.16). 93% of households are family-led. County health: 35% adult obesity, 13% smoke.
- 2.2 people per household.
- 7% non-family households (singles, roommates).
Population & Trend
Population shrank 26.5% from 532 (2022) to 391 (2024). Estimated 2026 population: ~294 (extrapolated at -13.2%/yr trend). Census Bureau Vintage estimate: 190.
| Census data vintage | 2024 |
|---|---|
| Population | 113,777 people |
| Annual growth rate · Population change | -26.5% |
| Annual growth rate · Population (2022) | 532 |
| Annual growth rate · Population (2024) | 391 |
| Annual growth rate · Trend category | shrinking |
| Population | 391 people |
| Population Estimate | 190 |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 61.7y is 22.8 years older than the U.S. median (38.9y). Children under 18 make up 12% — below the U.S. share of ~22%.
| Age Summary · Median age | 61.7 years (vs Maryland 39.3y) |
|---|---|
| Age Summary · Children Pct | 12.5% |
| Age Summary · Character | retirement community |
| Population under 18 | 49 |
| Median age | 61.7 years (vs Maryland 39.3y) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Race, Ethnicity & Diversity
Of 391 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups). The Simpson diversity index is 0.16 (0 = single group, 1 = perfectly even distribution); this is read as relatively homogeneous.
| White residents | 485 |
|---|---|
| Asian residents | 26 |
| Hispanic or Latino residents | 21 |
| Diversity Index · Diversity index (Simpson) | 16.5% |
| Diversity Index · Diversity label | relatively homogeneous |
| Diversity Index · Groups counted | 3 |
| Diversity Index · Largest group share | 91.2% |
| Asian population | 5.6% |
| Hispanic or Latino population | 1.3% |
| White (non-Hispanic) population | 93.1% |
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 (7)
Citizenship & Origin
Where residents were born and their citizenship status (Census ACS). 6.4% are foreign-born — below the U.S. average of 13.9%. 6% have naturalized to U.S. citizenship.
| Residents born in this state | 118 |
|---|---|
| Residents born in another state | 226 |
| Share born in this state | 30.2% |
| Share born in another state | 69.8% |
| Native-born U.S. citizens | 57.8% |
| Foreign-born residents | 6.4% |
| Naturalized citizens | 5.6% |
| Total foreign-born residents | 30 |
| From Africa | 30 |
Households & Family Composition
175 households. Averaging 2.9 people each — larger than the U.S. average of 2.5. 93% are family households — above the U.S. share of ~65%. Of 171 families, 39% are married couples with children.
| Children under 18 | 123 |
|---|---|
| Total families | 171 |
| Married couples with children | 67 |
| Average household size | 2.88 |
| Grandparents living with grandchildren | 1,861 |
| Grandparents responsible for grandchildren | 953 |
| Family households | 162 households |
| Households that are families | 92.6% |
| Total households | 175 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.
| 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 | 8 |
|---|---|
| Disability rate | 1.7% |
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 | 1.50 |
| Family Score · Schools | 1 |
| Family Score · Children Pct | 12.5% |
| Family Score · Rating | limited |
| Town Summary · Key Facts | population 391, shrinking, retirement community, affluent, white collar |
| Town Summary · Population | 391 people |
| Town Summary · County | St. Mary's County |
Sources: NCES school congressional district assignment · federal dataset cascade