St. Johns County: Demographics & People
About 306,934 people live in St. Johns County. Median age 44.2 years. (1.6y older than Florida). Population is 9% Hispanic or Latino and 5% Black. County is gaining 33,939 residents per year (2022-2023). County health: 25% adult obesity, 15% smoke.
Population & Trend
Current population 306,934; figures track the most recent Census ACS 5-year estimates.
| Population | 306,934 people (vs Florida 58,838) |
|---|---|
| Total Town Population | 152,017 people |
Age Distribution
Median age 44.2y is 5.3 years older than the U.S. median (38.9y).
| Age Summary · Total Pop | 306,934 |
|---|---|
| Age Summary · Under 18 | 66,193 |
| Age Summary · 18 To 34 | 48,315.0× |
| Age Summary · 35 To 64 | 127,809.0× |
| Age Summary · 65 Plus | 64,617 |
| Age Summary · Pct Under 18 | 21.6% |
| Age Summary · Pct 18 To 34 | 15.7% |
| Age Summary · Pct 35 To 64 | 41.6% |
| Median age | 44.2 years (vs Florida 40.9y) |
Sources: Census ACS 5-Year 2024 — county-level query · Refreshed 2026-04-28
Race, Ethnicity & Diversity
Of 306,934 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups).
| Census Demographics · Total Population | 306,934 people |
|---|---|
| White residents | 243,237 |
| Black residents | 15,694 |
| Asian residents | 11,538 |
| Census Demographics · Aian | 266 |
| Census Demographics · Nhpi | 134 |
| Census Demographics · Other Race | 6,155 |
| Census Demographics · Two Or More Races | 29,910 |
| Diversity Index | 35.8% |
| Asian population | 3.8% (vs Florida 2.5%) |
| Black population | 5.1% (vs Florida 13.0%) |
| Hispanic or Latino population | 9.1% (vs Florida 23.4%) |
Sources: Census ACS 5-Year 2024 — county-level query · Refreshed 2026-04-28
Citizenship & Origin
Where residents were born and their citizenship status (Census ACS).
| Census Citizenship · Total | 306,934 |
|---|---|
| Census Citizenship · Native | 277,963 |
| Residents born in this state | 99,320 |
| Residents born in another state | 171,012 |
| Census Citizenship · Foreign Born | 53,939 |
| Census Citizenship · Naturalized | 14,207 |
| Census Citizenship · Non Citizen | 7,631 |
| Foreign-born residents | 17.6% |
Sources: Census ACS 5-Year 2024 — county-level query · Refreshed 2026-04-28
Residential Stability & Migration
How long residents have lived here and where they came from. The surrounding county is gaining 33,939 residents per year on net (IRS migration data).
| 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 2022-2023
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.
| Census Disability · Total Pop | 304,726 |
|---|---|
| With Disability | 33,753 |
| Pct With Disability | 11.1% |
Sources: Census ACS 5-Year 2024 — county-level query · Refreshed 2026-04-28
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. 0 residents live in group quarters.
| Census Group Quarters · Total | 3,213 |
|---|
Sources: Census ACS 5-Year 2024 — county-level query · Refreshed 2026-04-28
Other
| Census Mobility · Total | 304,150 |
|---|---|
| Census Mobility · Same House | 259,910 |
| Census Mobility · Same County | 14,574 |
| Census Mobility · Diff County Same State | 12,039 |
| Census Mobility · Diff State | 16,168 |
| Census Mobility · From Abroad | 1,459 |
| Census Mobility · Moved Total | 44,240 |
| Census Mobility · Pct Moved In Year | 14.6% |
| Pct White | 79.2% |
Sources: Census ACS 5-Year 2024 — county-level query · Refreshed 2026-04-28