St. Marks: Demographics & People
St. Marks's population stands at 243 people, in 121 households. Population shrank 11.0% from 273 (2022) to 243 (2024). Median age 61.0 years. (18.7y older than Wakulla County; 18.4y older than Florida). Children under 18 are 2% of the population. Population is 96% White (non-Hispanic). The community is relatively homogeneous (Simpson index 0.00). 76% of households are family-led. County is gaining 2,757 residents per year (2022-2023). County health: 37% adult obesity, 17% smoke.
- 2.0 people per household (vs Florida avg 2.6).
- 24% non-family households (singles, roommates) (vs Florida 35%).
Population & Trend
Population shrank 11.0% from 273 (2022) to 243 (2024). Estimated 2026 population: ~217 (extrapolated at -5.5%/yr trend). Census Bureau Vintage estimate: 185.
| Census data vintage | 2024 |
|---|---|
| Population | 33,764 people |
| Annual growth rate · Population change | -11.0% |
| Annual growth rate · Population (2022) | 273 |
| Annual growth rate · Population (2024) | 243 |
| Annual growth rate · Trend category | shrinking |
| Population | 243 people (vs Florida 58,838) |
| Population Estimate | 185 |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 61.0y is 22.1 years older than the U.S. median (38.9y). Children under 18 make up 2% — below the U.S. share of ~22%.
| Age Summary · Median age | 61.0 years (vs Florida 40.9y) |
|---|---|
| Age Summary · Children Pct | 1.6% |
| Age Summary · Character | retirement community |
| Population under 18 | 4 |
| Median age | 61.0 years (vs Florida 40.9y) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Race, Ethnicity & Diversity
Of 243 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 | 267 |
|---|---|
| Diversity Index · Diversity label | relatively homogeneous |
| Diversity Index · Groups counted | 1 |
| Diversity Index · Largest group share | 100.0% |
| White (non-Hispanic) population | 95.9% (vs Florida 46.8%) |
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 (5)
Citizenship & Origin
Where residents were born and their citizenship status (Census ACS).
| Residents born in this state | 129 |
|---|---|
| Residents born in another state | 114 |
| Share born in this state | 53.1% |
| Share born in another state | 46.9% |
| Native-born U.S. citizens | 46.9% |
| Total foreign-born residents | 898 |
Households & Family Composition
121 households. Averaging 2.0 people each — smaller than the U.S. average of 2.5. 76% are family households — above the U.S. share of ~65%. Of 104 families, 1% are married couples with children.
| Children under 18 | 4 |
|---|---|
| Total families | 104 |
| Married couples with children | 1 |
| Single-parent households | 9 |
| Average household size | 1.99 |
| Women who gave birth (past year) | 38.4% |
| Grandparents living with grandchildren | 995 |
| Grandparents responsible for grandchildren | 272 |
| Family households | 92 households (vs Florida 15,074) |
| Households that are families | 76.0% (vs Florida 64.6%) |
| Total households | 121 households (vs Florida 22,144) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Residential Stability & Migration
How long residents have lived here and where they came from. 14.4% moved within the county in the past year — the U.S. baseline is roughly 8–10%. The surrounding county is gaining 2,757 residents per year on net (IRS migration data).
| Moved within the county (past year) | 14.4% |
|---|---|
| Migration · People moving in (annual) | 33,368 |
| Migration · People moving out (annual) | 30,611 |
| Migration · Net migration (in − out) | 2,757 |
| 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 | 31 |
|---|---|
| Disability rate | 10.7% |
Other
| Congressional District · District | 2 |
|---|---|
| Congressional District · Formatted | FL-02 |
| Congressional District · Congress | 118th |
| Cdc Birth Rate · Fips | 12,129 |
| Cdc Birth Rate · State Fips | 12 |
| Cdc Birth Rate · County Fips | 129 |
| Cdc Birth Rate · County | Wakulla |
| Cdc Birth Rate · Birth Rate | 21.0% |
| Cdc Birth Rate · Lower Ci | 17.00 |
| Cdc Birth Rate · Upper Ci | 25.70 |
| Cdc Mortality · Fips | 12,129 |
| Cdc Mortality · County | Wakulla County |
| Cdc Mortality · Urban Rural | Medium metro |
| Cdc Mortality · Total Deaths 2020 2023 | 765 |
| Cdc Vaccination · Fips | 12,129 |
| Cdc Vaccination · County | Wakulla County |
| Cdc Vaccination · Dose1 Pop Pct | 55.2% |
| Cdc Vaccination · Series Complete Pct | 46.2% |
| Cdc Vaccination · Booster Pct | 43.1% |
| Cdc Vaccination · Population 2019 | 33,739 |
| Cdc Vaccination · Metro Status | Metro |
| Family Score · Score | 8.00 |
| Family Score · Schools | 14 |
| Family Score · Children Pct | 1.6% |
| Family Score · Rating | excellent |
| Town Summary · Key Facts | population 243, shrinking, retirement community, middle-class, mixed |
| Town Summary · Population | 243 people (vs Florida 58,838) |
| Town Summary · County | Wakulla County |
Sources: Census place-to-CD118 crosswalk (place_fips) · federal dataset cascade