St. Leonard: Demographics & People
Census counts 726 people in St. Leonard, in 210 households. Population grew 29.2% from 562 (2022) to 726 (2024). Median age 41.5 years. (0.7y older than Calvert County; 2.2y older than Maryland). Children under 18 are 30% of the population. Population is 80% White (non-Hispanic) and 18% Hispanic or Latino. The community is somewhat diverse (Simpson index 0.39). 94% of households are family-led. County is losing 524 residents per year (2022-2023). County health: 34% adult obesity, 11% smoke.
- 3.5 people per household.
- 6% non-family households (singles, roommates).
Population & Trend
Population grew 29.2% from 562 (2022) to 726 (2024) — about 48.6× the recent U.S. annual rate of ~0.6%/yr. Estimated 2026 population: ~953 (extrapolated at 14.6%/yr trend). Census Bureau Vintage estimate: 1,319.
| Census data vintage | 2024 |
|---|---|
| Population | 92,783 people |
| Annual growth rate · Population change | 29.2% |
| Annual growth rate · Population (2022) | 562 |
| Annual growth rate · Population (2024) | 726 |
| Annual growth rate · Population growing | Yes |
| Annual growth rate · Trend category | booming |
| Population | 726 people |
| Population Estimate | 1,319 |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 41.5y is 2.6 years older than the U.S. median (38.9y). Children under 18 make up 30% — above the U.S. share of ~22%.
| Age Summary · Median age | 41.5 years (vs Maryland 39.3y) |
|---|---|
| Age Summary · Children Pct | 30.2% |
| Age Summary · Character | established |
| Population under 18 | 219 |
| Median age | 41.5 years (vs Maryland 39.3y) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Race, Ethnicity & Diversity
Of 726 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups). The Simpson diversity index is 0.39 (0 = single group, 1 = perfectly even distribution); this is read as somewhat diverse.
| White residents | 435 |
|---|---|
| Black residents | 9 |
| Hispanic or Latino residents | 142 |
| Diversity Index · Diversity index (Simpson) | 39.0% |
| Diversity Index · Diversity label | somewhat diverse |
| Diversity Index · Groups counted | 3 |
| Diversity Index · Largest group share | 74.2% |
| Hispanic or Latino population | 17.8% |
| White (non-Hispanic) population | 80.4% |
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).
| Residents born in this state | 477 |
|---|---|
| Residents born in another state | 205 |
| Share born in this state | 65.7% |
| Share born in another state | 34.3% |
| Native-born U.S. citizens | 28.2% |
| Naturalized citizens | 6.1% |
| Total foreign-born residents | 72 |
| From Europe | 8 |
Households & Family Composition
210 households. Averaging 2.9 people each — larger than the U.S. average of 2.5. 94% are family households — above the U.S. share of ~65%. Of 164 families, 54% are married couples with children.
| Children under 18 | 98 |
|---|---|
| Total families | 164 |
| Married couples with children | 88 |
| Average household size | 2.90 |
| Women who gave birth (past year) | 6.3% |
| Grandparents living with grandchildren | 12 |
| Grandparents responsible for grandchildren | 12 |
| Family households | 197 households |
| Households that are families | 93.8% |
| Total households | 210 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. 2.2% moved within the county in the past year — the U.S. baseline is roughly 8–10%. The surrounding county is losing 524 residents per year on net (IRS migration data).
| Moved within the county (past year) | 2.2% |
|---|---|
| Migration · People moving in (annual) | 93,739 |
| Migration · People moving out (annual) | 94,263 |
| Migration · Net migration (in − out) | -524 |
| 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 | 30 |
|---|---|
| Disability rate | 5.1% |
Other
| Congressional District · District | 5 |
|---|---|
| Congressional District · Formatted | MD-05 |
| Congressional District · Congress | 118th |
| Cdc Birth Rate · Fips | 24,009 |
| Cdc Birth Rate · State Fips | 24 |
| Cdc Birth Rate · County Fips | 9 |
| Cdc Birth Rate · County | Calvert |
| Cdc Birth Rate · Birth Rate | 7.7% |
| Cdc Birth Rate · Lower Ci | 6.30 |
| Cdc Birth Rate · Upper Ci | 9.20 |
| Cdc Mortality · Fips | 24,009 |
| Cdc Mortality · County | Calvert County |
| Cdc Mortality · Urban Rural | Large fringe metro |
| Cdc Mortality · Total Deaths 2020 2023 | 2,363 |
| Cdc Vaccination · Fips | 24,009 |
| Cdc Vaccination · County | Calvert County |
| Cdc Vaccination · Dose1 Pop Pct | 82.7% |
| Cdc Vaccination · Series Complete Pct | 73.9% |
| Cdc Vaccination · Booster Pct | 56.0% |
| Cdc Vaccination · Population 2019 | 92,525 |
| Cdc Vaccination · Metro Status | Metro |
| Family Score · Score | 10 |
| Family Score · Schools | 20 |
| Family Score · Children Pct | 30.2% |
| Family Score · Rating | excellent |
| Town Summary · Key Facts | population 726, booming, established, affluent, mixed |
| Town Summary · Population | 726 people |
| Town Summary · County | Calvert County |
Sources: Census place-to-CD118 crosswalk (place_fips) · federal dataset cascade