St. Augustine South: Demographics & People
St. Augustine South is home to 4,714 people, in 2,113 households. Population shrank 3.1% from 4,864 (2022) to 4,714 (2024). Median age 50.4 years. (6.2y older than St. Johns County; 7.8y older than Florida). Children under 18 are 13% of the population. Population is 86% White (non-Hispanic) and 8% Hispanic or Latino. The community is somewhat diverse (Simpson index 0.21). 69% of households are family-led. County is gaining 33,939 residents per year (2022-2023). County health: 26% adult obesity, 9% smoke.
- 2.2 people per household (vs Florida avg 2.6).
- 31% non-family households (singles, roommates) (vs Florida 35%).
Population & Trend
Population shrank 3.1% from 4,864 (2022) to 4,714 (2024). Estimated 2026 population: ~4,569 (extrapolated at -1.5%/yr trend). Census Bureau Vintage estimate: 4,382.
| Census data vintage | 2024 |
|---|---|
| Population | 273,425 people |
| Annual growth rate · Population change | -3.1% |
| Annual growth rate · Population (2022) | 4,864 |
| Annual growth rate · Population (2024) | 4,714 |
| Annual growth rate · Trend category | declining |
| Population | 4,714 people (vs Florida 58,838) |
| Population Estimate | 4,382 |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 50.4y is 11.5 years older than the U.S. median (38.9y). Children under 18 make up 13% — below the U.S. share of ~22%.
| Age Summary · Median age | 50.4 years (vs Florida 40.9y) |
|---|---|
| Age Summary · Children Pct | 13.3% |
| Age Summary · Character | retirement community |
| Population under 18 | 627 |
| Median age | 50.4 years (vs Florida 40.9y) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Race, Ethnicity & Diversity
Of 4,714 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups). The Simpson diversity index is 0.21 (0 = single group, 1 = perfectly even distribution); this is read as somewhat diverse.
| White residents | 4,298 |
|---|---|
| Black residents | 66 |
| Asian residents | 249 |
| Hispanic or Latino residents | 248 |
| Diversity Index · Diversity index (Simpson) | 21.3% |
| Diversity Index · Diversity label | somewhat diverse |
| Diversity Index · Groups counted | 4 |
| Diversity Index · Largest group share | 88.4% |
| Asian population | 5.1% (vs Florida 2.5%) |
| Black population | 0.2% (vs Florida 13.0%) |
| Hispanic or Latino population | 7.6% (vs Florida 23.4%) |
| White (non-Hispanic) population | 85.7% (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 (8)
Citizenship & Origin
Where residents were born and their citizenship status (Census ACS). 4.4% are foreign-born — below the U.S. average of 13.9%. 2% have naturalized to U.S. citizenship.
| Residents born in this state | 2,170 |
|---|---|
| Residents born in another state | 2,222 |
| Share born in this state | 46.0% |
| Share born in another state | 54.0% |
| Native-born U.S. citizens | 47.1% |
| Foreign-born residents | 4.4% |
| Naturalized citizens | 2.4% |
| Total foreign-born residents | 136 |
| From Europe | 21 |
| From Africa | 77 |
Households & Family Composition
2,113 households. Averaging 2.3 people each — smaller than the U.S. average of 2.5. 69% are family households — above the U.S. share of ~65%. Of 1,401 families, 13% are married couples with children.
| Children under 18 | 746 |
|---|---|
| Total families | 1,401 |
| Married couples with children | 186 |
| Single-parent households | 102 |
| Average household size | 2.29 |
| Women who gave birth (past year) | 22.3% |
| Grandparents living with grandchildren | 82 |
| Grandparents responsible for grandchildren | 44 |
| Family households | 1,458 households (vs Florida 15,074) |
| Households that are families | 69.0% (vs Florida 64.6%) |
| Total households | 2,113 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. 8.4% moved within the county in the past year — the U.S. baseline is roughly 8–10%. The surrounding county is gaining 33,939 residents per year on net (IRS migration data).
| Moved within the county (past year) | 8.4% |
|---|---|
| Migration · People moving in (annual) | 334,131 |
| Migration · People moving out (annual) | 300,192 |
| Migration · Net migration (in − out) | 33,939 |
| 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 | 379 |
|---|---|
| Disability rate | 7.5% |
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. 33 residents live in group quarters (0.7% of population).
| Living in group quarters | 33 |
|---|
Other
| Congressional District · District | 6 |
|---|---|
| Congressional District · Formatted | FL-06 |
| Congressional District · Congress | 118th |
| Cdc Birth Rate · Fips | 12,109 |
| Cdc Birth Rate · State Fips | 12 |
| Cdc Birth Rate · County Fips | 109 |
| Cdc Birth Rate · County | St Johns |
| Cdc Birth Rate · Birth Rate | 6.7% |
| Cdc Birth Rate · Lower Ci | 5.80 |
| Cdc Birth Rate · Upper Ci | 7.60 |
| Cdc Mortality · Fips | 12,109 |
| Cdc Mortality · County | St. Johns County |
| Cdc Mortality · Urban Rural | Large fringe metro |
| Cdc Mortality · Total Deaths 2020 2023 | 6,791 |
| Cdc Vaccination · Fips | 12,109 |
| Cdc Vaccination · County | St. Johns County |
| Cdc Vaccination · Dose1 Pop Pct | 81.2% |
| Cdc Vaccination · Series Complete Pct | 72.8% |
| Cdc Vaccination · Booster Pct | 50.2% |
| Cdc Vaccination · Population 2019 | 264,672 |
| Cdc Vaccination · Metro Status | Metro |
| Family Score · Score | 3.50 |
| Family Score · Schools | 5 |
| Family Score · Children Pct | 13.3% |
| Family Score · Rating | fair |
| Town Summary · Key Facts | population 4,714, declining, retirement community, upper-middle, mixed |
| Town Summary · Population | 4,714 people (vs Florida 58,838) |
| Town Summary · County | St. Johns County |
Sources: Census place-to-CD118 crosswalk (place_fips) · federal dataset cascade