Population 306,934 · Census ACS 2020–24
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Population and households in St. Johns County
Household size in St. Johns County
| Period | St. Johns County | Jacksonville area | Florida | U.S. |
|---|---|---|---|---|
| 2006–10 | 2.69 | 2.63 | 2.63 | 2.68 |
| 2010–14 | 2.71 | 2.68 | 2.73 | 2.73 |
| 2015–19 | 2.80 | 2.66 | 2.75 | 2.71 |
| 2020–24 | 2.74 | 2.58 | 2.63 | 2.65 |
| Change | +0.05 | −0.05 | +0.00 | −0.03 |
Households in St. Johns County average 2.74 people, a bit above the national 2.65, so families with children are somewhat more common here. Since 2006–10, household size has crept up from 2.69, even as the national average fell. Households are largest in the northwest and smallest in the east.
Household size: the average number of people living in each occupied home. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25010).
Median age in St. Johns County
| Period | St. Johns County | Jacksonville area | Florida | U.S. |
|---|---|---|---|---|
| 2006–10 | 40.8 | 37.4 | 40.8 | 37.7 |
| 2010–14 | 42.4 | 38.8 | 42.0 | 38.6 |
| 2015–19 | 43.6 | 39.5 | 43.0 | 39.6 |
| 2020–24 | 44.7 | 40.4 | 43.5 | 40.1 |
| Change | +3.9 | +3.1 | +2.7 | +2.3 |
With a median age of 44.7, St. Johns County is noticeably older than the country as a whole (40.1), an age mix that tilts toward empty nesters and retirees. The median age has climbed from 40.8 in 2006–10, as it has nationally. Residents skew youngest in the northwest and oldest in the southeast.
Median age: the age that splits residents into two equal halves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B01002).
Single-parent households in St. Johns County
| Period | St. Johns County | Jacksonville area | Florida | U.S. |
|---|---|---|---|---|
| 2006–10 | 8.5% | 12.2% | 12.4% | 12.3% |
| 2010–14 | 7.8% | 12.2% | 12.2% | 12.3% |
| 2015–19 | 8.1% | 12.0% | 11.5% | 11.6% |
| 2020–24 | 7.1% | 11.7% | 11.4% | 11.6% |
| Change | −1.4 pts | −0.4 pts | −1.0 pts | −0.6 pts |
Single-parent households are relatively rare in St. Johns County: 7.1% of households, against 11.6% nationally. Since 2006–10, the single-parent share has edged down 1.4 points, in line with the national trend. Only three of Florida's 67 counties have a lower share of single-parent households.
Single-parent households: households where one adult with no spouse present lives with children under 18. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B11003).
Housing in St. Johns County
Renters in St. Johns County
| Period | St. Johns County | Jacksonville area | Florida | U.S. |
|---|---|---|---|---|
| 2006–10 | 22.9% | 31.8% | 30.3% | 33.3% |
| 2010–14 | 24.4% | 34.2% | 33.9% | 35.6% |
| 2015–19 | 19.6% | 35.5% | 34.6% | 36.0% |
| 2020–24 | 17.8% | 33.5% | 32.4% | 34.8% |
| Change | −5.1 pts | +1.7 pts | +2.1 pts | +1.5 pts |
St. Johns County is largely a place of homeowners: only 17.8% of households rent, far below the national share of 34.8%. Owner-heavy areas like this tend to see less turnover. Among homeowners, 32.1% have no mortgage at all, below the national share of 39.8%. The renter share has fallen 5.1 points since 2006–10, even as the national share rose.
Renters: occupied homes that are rented rather than owned. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25003).
Vacant homes in St. Johns County
| Period | St. Johns County | Jacksonville area | Florida | U.S. |
|---|---|---|---|---|
| 2006–10 | 14.1% | 13.4% | 17.2% | 11.4% |
| 2010–14 | 12.4% | 13.8% | 17.6% | 11.4% |
| 2015–19 | 13.4% | 11.8% | 15.4% | 11.1% |
| 2020–24 | 10.5% | 9.4% | 12.5% | 9.6% |
| Change | −3.6 pts | −4.1 pts | −4.8 pts | −1.8 pts |
Vacancy in St. Johns County is close to the national rate: 10.5% of homes are empty, against 9.6%. Since 2006–10, vacancy has fallen 3.6 points, in line with the national trend. St. Johns County has a lower vacancy rate than at least four in five Florida counties.
Vacant homes: homes with no one living in them, including vacation homes and homes for sale or rent. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25002).
Age of homes in St. Johns County
| Period | St. Johns County | Jacksonville area | Florida | U.S. |
|---|---|---|---|---|
| 2006–10 | 1995 | 1985 | 1984 | 1974 |
| 2010–14 | 1996 | 1986 | 1985 | 1975 |
| 2015–19 | 1998 | 1987 | 1986 | 1977 |
| 2020–24 | 2005 | 1992 | 1989 | 1980 |
| Change | +10 | +7 | +5 | +6 |
St. Johns County has newer housing than the country as a whole: the median home was built in 2005, versus 1980 nationally. The median year built has moved up from 1995 in 2006–10, a sign of steady new building. The newest homes are mostly in the west, the oldest in the east. St. Johns County has the newest homes of any Florida county.
Age of homes: the year that splits the housing stock into older and newer halves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25035).
Rent in St. Johns County
| Period | St. Johns County | Jacksonville area | Florida | U.S. |
|---|---|---|---|---|
| 2006–10 | $1,276 | $1,041 | $1,092 | $965 |
| 2010–14 | $1,333 | $1,106 | $1,123 | $1,040 |
| 2015–19 | $1,573 | $1,251 | $1,323 | $1,213 |
| 2020–24 | $2,274 | $1,750 | $1,816 | $1,571 |
| Change | +$999 | +$709 | +$724 | +$606 |
A typical rental in St. Johns County costs $2,274 a month with utilities, well above the national median of $1,571. Rent has climbed $999 a month since 2006–10, up 78%, faster than rents rose nationally. The typical renter here spends 36.7% of household income on rent, well over the 30% mark often used to define affordable rent, so many renters here are stretched. St. Johns County has the highest rents of any Florida county.
Rent: monthly rent plus the utilities renters pay themselves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25064).
Education in St. Johns County
Bachelor's degrees in St. Johns County
| Period | St. Johns County | Jacksonville area | Florida | U.S. |
|---|---|---|---|---|
| 2006–10 | 39.0% | 26.9% | 26.4% | 28.4% |
| 2010–14 | 42.9% | 28.4% | 27.0% | 29.6% |
| 2015–19 | 45.7% | 31.4% | 30.0% | 32.1% |
| 2020–24 | 53.0% | 36.7% | 34.6% | 35.6% |
| Change | +14.0 pts | +9.8 pts | +8.2 pts | +7.2 pts |
College graduates are unusually common in St. Johns County: 53.0% of adults 25 and older have a bachelor's degree or higher, against 35.6% nationally. Education tends to track local incomes and the kinds of jobs nearby. The share with a degree is up 14.0 points from 2006–10, mirroring the country. No other Florida county has a higher share of college graduates.
Bachelor's degrees: adults 25 and older with a bachelor's degree or higher. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B15003).
High school graduates in St. Johns County
| Period | St. Johns County | Jacksonville area | Florida | U.S. |
|---|---|---|---|---|
| 2006–10 | 93.0% | 88.5% | 85.5% | 84.9% |
| 2010–14 | 94.2% | 89.6% | 86.5% | 86.1% |
| 2015–19 | 95.2% | 90.9% | 88.2% | 87.7% |
| 2020–24 | 96.1% | 92.2% | 90.0% | 89.3% |
| Change | +3.1 pts | +3.7 pts | +4.4 pts | +4.3 pts |
High school completion is high in St. Johns County: 96.1% of adults 25 and older have a diploma or equivalent, well above the national rate of 89.3%. The share with a diploma is up 3.1 points from 2006–10, as it has nationally. No other Florida county has a higher share of high school graduates.
High school graduates: adults 25 and older with a high school diploma, GED or more. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B15003).
Jobs in St. Johns County
| Period | St. Johns County | Jacksonville area | Florida | U.S. |
|---|---|---|---|---|
| 2006–10 | 6.4% | 8.2% | 8.9% | 8.1% |
| 2010–14 | 7.0% | 10.7% | 11.0% | 9.4% |
| 2015–19 | 4.6% | 5.7% | 5.7% | 5.6% |
| 2020–24 | 3.1% | 4.2% | 4.8% | 5.4% |
| Change | −3.3 pts | −4.0 pts | −4.1 pts | −2.7 pts |
Unemployment in St. Johns County has been low: just 3.1% of the labor force was out of work and looking, well below the national rate of 5.4%. Only three of Florida's 67 counties have lower unemployment. Unemployment is down 3.3 points from 2006–10, in line with the national trend.
Unemployment: people looking for work as a share of everyone working or looking. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B23025).
St. Johns County compared with nearby counties
| County | Household size | Median age | Single parents | Renters | Vacant homes | Median year built | Median rent | Bachelor's degree | High school diploma | Unemployment |
|---|---|---|---|---|---|---|---|---|---|---|
| St. Johns County | 2.74 | 44.7 | 7.1% | 17.8% | 10.5% | 2005 | $2,274 | 53.0% | 96.1% | 3.1% |
| Clay County | 2.75 | 41.3 | 10.5% | 24.1% | 6.7% | 1995 | $1,739 | 27.9% | 92.5% | 3.7% |
| Duval County | 2.49 | 38.5 | 13.6% | 41.8% | 9.2% | 1986 | $1,601 | 33.9% | 91.0% | 4.6% |
| Putnam County | 2.42 | 44.2 | 14.1% | 24.6% | 14.7% | 1984 | $915 | 14.0% | 81.9% | 7.2% |
| Flagler County | 2.46 | 51.2 | 8.7% | 17.0% | 12.9% | 2001 | $1,696 | 31.0% | 93.3% | 4.2% |
| Bradford County | 2.65 | 41.2 | 15.5% | 26.7% | 14.1% | 1985 | $958 | 14.9% | 83.5% | 4.4% |
| Baker County | 2.89 | 35.3 | 8.9% | 14.9% | 10.8% | 1996 | $1,327 | 18.1% | 87.5% | 4.7% |
| Union County | 2.59 | 37.6 | 11.5% | 25.3% | 11.3% | 1991 | $942 | 12.6% | 82.4% | 5.5% |
| Alachua County | 2.32 | 35.9 | 9.6% | 45.9% | 9.7% | 1988 | $1,427 | 50.5% | 94.7% | 4.5% |
| Columbia County | 2.50 | 42.1 | 14.4% | 27.5% | 10.6% | 1989 | $1,045 | 17.0% | 86.2% | 6.4% |
| Gilchrist County | 2.55 | 43.6 | 12.9% | 14.3% | 8.4% | 1997 | $1,040 | 15.7% | 86.9% | 3.3% |
All figures 2020–24.
Counties with similar populations: Hays County, TX · St. Joseph County, IN · Spartanburg County, SC · Shelby County, AL · Sangamon County, IL · Kalamazoo County, MI · Johnston County, NC · Jefferson County, MO · Jackson County, OR · Ingham County, MI
About these numbers
Every figure on this page is a BestNeighborhood calculation from the Census Bureau's American Community Survey (ACS), built up from the Census block groups that make up St. Johns County. Each ACS 5-year release pools five years of responses; this page shows the last 15 releases, 2006–10 through 2020–24. Neighboring releases share four of their five years, so they move gradually and small changes between them are within the survey's margin of error; in small places the lines can jump from one release to the next for the same reason. The maps show the same measures for each neighborhood, ranked against the whole country.
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