St. George Island: Demographics & People
St. George Island's population stands at 277 people, in 110 households. Population grew 629.0% from 38 (2022) to 277 (2024). Median age 45.2 years. (8.0y older than St. Mary's County; 5.9y older than Maryland). Children under 18 are 35% of the population. Population is 77% White (non-Hispanic) and 23% Black. The community is relatively homogeneous (Simpson index 0.00). 71% of households are family-led. County health: 35% adult obesity, 13% smoke.
- 2.5 people per household.
- 29% non-family households (singles, roommates).
Population & Trend
Population grew 629.0% from 38 (2022) to 277 (2024) — about 1048.3× the recent U.S. annual rate of ~0.6%/yr. Estimated 2026 population: ~4,758 (extrapolated at 314.5%/yr trend). Census Bureau Vintage estimate: 28,539.
| Census data vintage | 2024 |
|---|---|
| Population | 113,777 people |
| Annual growth rate · Population change | 629.0% |
| Annual growth rate · Population (2022) | 38 |
| Annual growth rate · Population (2024) | 277 |
| Annual growth rate · Population growing | Yes |
| Annual growth rate · Trend category | booming |
| Population | 277 people |
| Population Estimate | 28,539 |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 45.2y is 6.3 years older than the U.S. median (38.9y). Children under 18 make up 35% — above the U.S. share of ~22%.
| Age Summary · Median age | 45.2 years (vs Maryland 39.3y) |
|---|---|
| Age Summary · Children Pct | 35.0% |
| Age Summary · Character | established |
| Population under 18 | 97 |
| Median age | 45.2 years (vs Maryland 39.3y) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Race, Ethnicity & Diversity
Of 277 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 | 38 |
|---|---|
| Diversity Index · Diversity label | relatively homogeneous |
| Diversity Index · Groups counted | 1 |
| Diversity Index · Largest group share | 100.0% |
| Black population | 23.1% |
| White (non-Hispanic) population | 76.9% |
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 (2)
Citizenship & Origin
Where residents were born and their citizenship status (Census ACS).
| Residents born in this state | 199 |
|---|---|
| Residents born in another state | 78 |
| Share born in this state | 71.8% |
| Share born in another state | 28.2% |
| Native-born U.S. citizens | 28.2% |
| Total foreign-born residents | 5,713 |
Households & Family Composition
110 households. Averaging 1.3 people each — smaller than the U.S. average of 2.5. 71% are family households — above the U.S. share of ~65%.
| Average household size | 1.31 |
|---|---|
| Women who gave birth (past year) | 13.6% |
| Grandparents living with grandchildren | 1,861 |
| Grandparents responsible for grandchildren | 953 |
| Family households | 78 households |
| Households that are families | 70.9% |
| Total households | 110 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
Other
| Congressional District · District | 5 |
|---|---|
| Congressional District · Formatted | MD-05 |
| 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 | 10 |
| Family Score · Schools | 19 |
| Family Score · Children Pct | 35.0% |
| Family Score · Rating | excellent |
| Town Summary · Key Facts | population 277, booming, established, affluent, white collar |
| Town Summary · Population | 277 people |
| Town Summary · County | St. Mary's County |
Sources: Census place-to-CD118 crosswalk (place_fips) · federal dataset cascade