Population 14,791 · Census ACS 2020–24
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Population and households in Key Biscayne
Household size in Key Biscayne
| Period | Key Biscayne | Miami area | Florida | U.S. |
|---|---|---|---|---|
| 2006–10 | 2.82 | 2.80 | 2.63 | 2.68 |
| 2010–14 | 3.03 | 2.95 | 2.73 | 2.73 |
| 2015–19 | 2.96 | 2.97 | 2.75 | 2.71 |
| 2020–24 | 3.06 | 2.80 | 2.63 | 2.65 |
| Change | +0.24 | +0.00 | +0.00 | −0.03 |
Households in Key Biscayne are large by national standards, averaging 3.06 people against 2.65 for the U.S. That usually means more families with children at home. Since 2006–10, household size has climbed from 2.82, even as the national average fell.
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 Key Biscayne
| Period | Key Biscayne | Miami area | Florida | U.S. |
|---|---|---|---|---|
| 2006–10 | 39.6 | 39.9 | 40.8 | 37.7 |
| 2010–14 | 41.2 | 40.9 | 42.0 | 38.6 |
| 2015–19 | 43.2 | 41.9 | 43.0 | 39.6 |
| 2020–24 | 41.1 | 42.8 | 43.5 | 40.1 |
| Change | +1.4 | +2.9 | +2.7 | +2.3 |
Half of the people in Key Biscayne are younger than 41.1 and half are older, close to the national median of 40.1. The population here is younger than in the Miami area as a whole, where the median age is 42.8. The median age has climbed from 39.6 in 2006–10, mirroring the country.
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 Key Biscayne
| Period | Key Biscayne | Miami area | Florida | U.S. |
|---|---|---|---|---|
| 2006–10 | 7.3% | 14.3% | 12.4% | 12.3% |
| 2010–14 | 4.8% | 14.2% | 12.2% | 12.3% |
| 2015–19 | 3.7% | 13.3% | 11.5% | 11.6% |
| 2020–24 | 7.6% | 13.2% | 11.4% | 11.6% |
| Change | +0.3 pts | −1.1 pts | −1.0 pts | −0.6 pts |
Single-parent households are relatively rare in Key Biscayne: 7.6% of households, against 11.6% nationally. Key Biscayne has a lower share of single-parent households than most Florida cities.
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 Key Biscayne
Renters in Key Biscayne
| Period | Key Biscayne | Miami area | Florida | U.S. |
|---|---|---|---|---|
| 2006–10 | 23.5% | 34.2% | 30.3% | 33.3% |
| 2010–14 | 25.1% | 37.9% | 33.9% | 35.6% |
| 2015–19 | 30.4% | 40.7% | 34.6% | 36.0% |
| 2020–24 | 33.4% | 39.5% | 32.4% | 34.8% |
| Change | +10.0 pts | +5.3 pts | +2.1 pts | +1.5 pts |
About a third of households in Key Biscayne rent their homes (33.4%), close to the national share of 34.8%. Renters make up a smaller share here than in the Miami area as a whole (39.5%). Among homeowners, 53.3% have no mortgage at all, well above the national share of 39.8%. The renter share has risen 10.0 points since 2006–10, a much bigger shift than nationally.
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 Key Biscayne
| Period | Key Biscayne | Miami area | Florida | U.S. |
|---|---|---|---|---|
| 2006–10 | 34.3% | 15.4% | 17.2% | 11.4% |
| 2010–14 | 37.2% | 15.3% | 17.6% | 11.4% |
| 2015–19 | 36.2% | 13.1% | 15.4% | 11.1% |
| 2020–24 | 28.6% | 10.9% | 12.5% | 9.6% |
| Change | −5.7 pts | −4.5 pts | −4.8 pts | −1.8 pts |
Vacancy is high in Key Biscayne: 28.6% of homes are empty, far above the national rate of 9.6%. In resort and lake areas that usually means seasonal and vacation homes; elsewhere it can point to weak demand. Since 2006–10, vacancy has fallen 5.7 points, a much bigger shift than nationally.
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 Key Biscayne
| Period | Key Biscayne | Miami area | Florida | U.S. |
|---|---|---|---|---|
| 2006–10 | 1975 | 1979 | 1984 | 1974 |
| 2010–14 | 1977 | 1979 | 1985 | 1975 |
| 2015–19 | 1982 | 1980 | 1986 | 1977 |
| 2020–24 | 1978 | 1983 | 1989 | 1980 |
| Change | +3 | +4 | +5 | +6 |
The typical home in Key Biscayne was built around 1978, about the same vintage as the country's housing overall (1980). Homes here are older than in the Miami area overall, where the median home dates to 1983. The median year built has moved up from 1975 in 2006–10, a sign of steady new building. The newest homes are mostly in the east, the oldest in the north.
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 Key Biscayne
| Period | Key Biscayne | Miami area | Florida | U.S. |
|---|---|---|---|---|
| 2006–10 | $1,860 | $1,256 | $1,092 | $965 |
| 2010–14 | $1,884 | $1,306 | $1,123 | $1,040 |
| 2015–19 | $2,460 | $1,586 | $1,323 | $1,213 |
| 2020–24 | $3,396 | $2,112 | $1,816 | $1,571 |
| Change | +$1,536 | +$856 | +$724 | +$606 |
Rent in Key Biscayne runs $3,396 a month at the median, utilities included, well above the U.S. median of $1,571. Rents are up $1,536 a month from 2006–10, an 83% jump, faster than rents rose nationally. Rent takes 35.3% of the typical renter's income, well over the 30% mark often used to define affordable rent, so many renters here are stretched. Key Biscayne has the highest rents of any Florida city with 5,000+ people.
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 Key Biscayne
Bachelor's degrees in Key Biscayne
| Period | Key Biscayne | Miami area | Florida | U.S. |
|---|---|---|---|---|
| 2006–10 | 74.3% | 29.1% | 26.4% | 28.4% |
| 2010–14 | 73.5% | 29.3% | 27.0% | 29.6% |
| 2015–19 | 72.6% | 32.5% | 30.0% | 32.1% |
| 2020–24 | 76.9% | 37.1% | 34.6% | 35.6% |
| Change | +2.6 pts | +8.0 pts | +8.2 pts | +7.2 pts |
College graduates are unusually common in Key Biscayne: 76.9% 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 2.6 points from 2006–10, mirroring the country. No other Florida city with 5,000+ people 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 Key Biscayne
| Period | Key Biscayne | Miami area | Florida | U.S. |
|---|---|---|---|---|
| 2006–10 | 97.5% | 83.0% | 85.5% | 84.9% |
| 2010–14 | 97.5% | 84.2% | 86.5% | 86.1% |
| 2015–19 | 97.9% | 85.6% | 88.2% | 87.7% |
| 2020–24 | 95.9% | 87.4% | 90.0% | 89.3% |
| Change | −1.6 pts | +4.4 pts | +4.4 pts | +4.3 pts |
High school completion is high in Key Biscayne: 95.9% of adults 25 and older have a diploma or equivalent, well above the national rate of 89.3%. Since 2006–10, the share with a diploma has fallen 1.6 points, even as the national rate rose. Key Biscayne has a higher share of high school graduates than at least four in five Florida cities.
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 Key Biscayne
| Period | Key Biscayne | Miami area | Florida | U.S. |
|---|---|---|---|---|
| 2006–10 | 3.1% | 8.8% | 8.9% | 8.1% |
| 2010–14 | 4.9% | 11.3% | 11.0% | 9.4% |
| 2015–19 | 6.0% | 5.8% | 5.7% | 5.6% |
| 2020–24 | 3.1% | 5.0% | 4.8% | 5.4% |
| Change | −0.0 pts | −3.8 pts | −4.1 pts | −2.7 pts |
Unemployment in Key Biscayne has been low: just 3.1% of the labor force was out of work and looking, well below the national rate of 5.4%. Key Biscayne has lower unemployment than at least four in five Florida cities. Because the Census pools five years of responses (2020–24), these rates smooth over short swings and lag the current job market.
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).
Key Biscayne compared with nearby cities
| City | Household size | Median age | Single parents | Renters | Vacant homes | Median year built | Median rent | Bachelor's degree | High school diploma | Unemployment |
|---|---|---|---|---|---|---|---|---|---|---|
| Key Biscayne | 3.06 | 41.1 | 7.6% | 33.4% | 28.6% | 1978 | $3,396 | 76.9% | 95.9% | 3.1% |
| Shenandoah | 2.56 | 43.9 | 10.4% | 46.6% | 7.8% | 1962 | $1,833 | 46.6% | 85.6% | 3.5% |
| Coral Gables | 2.34 | 41.7 | 5.7% | 37.2% | 19.2% | 1970 | $2,644 | 67.1% | 96.4% | 3.7% |
| Miami Beach | 2.10 | 44.5 | 6.5% | 55.9% | 32.9% | 1968 | $2,101 | 61.3% | 92.7% | 3.9% |
| South Miami | 2.62 | 42.3 | 6.4% | 40.1% | 10.5% | 1971 | $2,156 | 62.8% | 95.1% | 3.8% |
| Miami area | 2.80 | 42.8 | 13.2% | 39.5% | 10.9% | 1983 | $2,112 | 37.1% | 87.4% | 5.0% |
| Pinecrest | 3.13 | 43.3 | 4.4% | 16.1% | 7.8% | 1973 | $2,766 | 74.4% | 97.9% | 3.2% |
| Glenvar Heights | 2.23 | 43.4 | 8.1% | 53.6% | 8.1% | 1981 | $1,994 | 60.4% | 93.7% | 6.2% |
| West Miami | 2.73 | 41.2 | 11.9% | 49.8% | 7.5% | 1987 | $2,169 | 42.0% | 83.1% | 2.1% |
| Coral Terrace | 2.97 | 46.7 | 13.5% | 39.4% | 8.7% | 1959 | $2,113 | 31.7% | 83.9% | 3.6% |
| Palmetto Bay | 3.04 | 42.0 | 5.5% | 19.6% | 7.3% | 1978 | $2,321 | 61.3% | 93.7% | 2.7% |
All figures 2020–24.
Cities with similar populations: Bradford, PA · Bulverde, TX · Bull Mountain, OR · Brock Hall, MD · Broadlands, VA · Brattleboro, VT · Brandywine, MD · Bradley, IL · Bradley Gardens, NJ · Burlington, WA
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 Key Biscayne. 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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