Key Biscayne, FL demographics:
population, income, and more

Total population
14,791
1.6% year-over-year change
Median household income
$181,505/yr
5.2% year-over-year change
Housing units
7,310
-2.5% year-over-year change

Key Biscayne population

How many people live in Key Biscayne

Key Biscayne is home to 14,791 residents, according to the most recent Census data. Gender-wise, 49.9% of Key Biscayne locals are male, and 50.1% are female.

Total population
14,791
1.6% year-over-year change
Gender ratio
Male
49.9%
7,385
Female
50.1%
7,406
Value Percent YoY change
Male 7,385 49.9% 1.7%
Female 7,406 50.1% 1.4%
A higher population often means more rental variety and livelier areas. The gender balance—how many men live here compared to women—can reveal a lot about the community and the lifestyles of its residents. Use this info to get a sense of the area's pace and personality.

Age demographics

The median age in Key Biscayne is 42, with the population distributed as follows: about 24.8% are children under 15, then 11.4% are in the 15 to 24 age group. Adults between 25 and 44 make up 17.8% of the population, while another 30.2% fall into the 45 to 64 bracket. Finally, around 15.7% are 65 or older.

Median age
42.2
Age breakdown
Under 15
24.8%
15 to 24
11.4%
25 to 44
17.8%
45 to 64
30.2%
Over 65
15.7%
Value Percent YoY change
Under 15 3,672 24.8% 4.3%
15 to 24 1,694 11.4% 4.4%
25 to 44 2,639 17.8% 7.3%
45 to 64 4,469 30.2% -2.0%
Over 65 2,317 15.7% -3.5%
The age composition helps you get insight into who lives in the area. A younger population might mean a more active, fast-paced vibe, while an older one could suggest a quieter, slower lifestyle. If there's a balanced makeup, you’re likely to find a variety of services, housing types, and community spaces that cater to different life stages.

Racial makeup

In Key Biscayne, 37.3% of the population are US-born citizens, while 30.3% have gained naturalized citizenship. At the same time, 32.5% of residents are non-citizens. As for race, 36.6% of locals are Caucasian, 0.8% are African American and 0.1% have Asian roots. There’s also a share of 58.7% that includes residents with two or more races.

Citizenship
U.S.-born citizens
37.3%
Non-U.S.-born citizens
30.3%
Non-citizens
32.5%
Value Percent YoY change
U.S.-born citizens 5,511 37.3% 2.6%
Non-U.S.-born citizens 4,479 30.3% -7.1%
Non-citizens 4,801 32.5% 10.0%
Racial breakdown
White
36.6%
Black or African American
0.8%
American Indian and Alaska Native
0.1%
Asian
0.1%
Native Hawaiian and other Pacific Islander
0%
Two or more races
58.7%
Other
3.7%
Value Percent
White 5,414 36.6%
Black or African American 116 0.8%
American Indian and Alaska Native 11 0.1%
Asian 21 0.1%
Two or more races 8,682 58.7%
Other 547 3.7%

Households in Key Biscayne

A peek inside Key Biscayne households

Key Biscayne has 4,945 households, with an average of 3 members in each. Of these, 78.2% are families, while the remaining 21.8% are made up of individuals living alone or with non-relatives, such as roommates.

Households stats

Total households
4,945
-0.8% year-over-year change
Average people per household
3
Non-family households
1,078
Family households
3,867
Value Percent YoY change
Non-family households 1,078 21.8% -8.2%
Family households 3,867 78.2% 1.5%
The mix between family and non-family households gives a glimpse into daily life. A higher percentage of families might mean more parks and schools, while more non-family setups can mean flexible housing and diverse living styles. For renters, this can signal what kinds of homes are common and can help you figure out if the area matches your lifestyle.

Housing in Key Biscayne

The housing landscape of Key Biscayne

Key Biscayne's housing consists of 7,310 units, with 18.6% being detached single-family homes ideal for those wanting space. Attached options, including duplexes and townhouses, make up 3.5% and offer a more compact, shared living style. Then there are the multifamily buildings in the area, and for those seeking flexibility, non-traditional options like mobile homes account for 0.6% of the housing landscape.

Housing units
7,310
-2.5% year-over-year change
Housing types
Value Percent
1 unit, detached 1,360 18.6%
1 unit, attached 255 3.5%
2 units 41 0.6%
3 or 4 units 14 0.2%
5 to 9 units 98 1.3%
10 to 19 units 237 3.2%
20 to 49 units 1,065 14.6%
50 or more units 4,198 57.4%
Mobile home 42 0.6%
Homes built since 2020
28
154.6% year-over-year change

The age of buildings in Key Biscayne

In Key Biscayne, the median construction year is 1977. About 0.4% of homes were built before the 1940s, with another 0.4% going up by 1949. Most development happened in the second half of the 20th century. Then, 8.5% of homes were added from 2000 to 2009, 4.5% between 2010 and 2019, and 0.4% are part of the newest wave of development.

Construction year breakdown by decade
Value Percent YoY change
Built in 1939 or earlier 32 0.4% 45.5%
Built between 1940 and 1949 29 0.4% -29.3%
Built between 1950 and 1959 644 8.8% 22.0%
Built between 1960 and 1969 1,035 14.2% -4.6%
Built between 1970 and 1979 2,585 35.4% 0.3%
Built between 1980 and 1989 1,037 14.2% -10.5%
Built between 1990 and 1999 971 13.3% -3.5%
Built between 2000 and 2009 623 8.5% -15.1%
Built between 2010 and 2019 326 4.5% -2.4%
Built in 2020 or later 28 0.4% 154.6%
As a renter, knowing when homes were built helps you understand the potential condition and design of rental units. Newer builds may have more contemporary layouts, while older homes can offer character or larger lots, depending on the area.

Key Biscayne occupancy rates

Out of the 4,945 occupied housing units in Key Biscayne, 66.6% are owner-occupied, while 33.4% are lived in by tenants. Meanwhile, 32.4% of all homes on the local market sit vacant.

Occupied housing units
4,945
-0.8% year-over-year change
Occupancy breakdown
Renter occupied
1,654
Owner occupied
3,291
Value Percent YoY
change
Renter occupied 1,654 33.4% 8.2%
Owner occupied 3,291 66.6% -4.8%
Unoccupied housing units
32.4%
Unoccupied housing units refer to homes that are currently without residents—whether they're waiting for renters or owners, used seasonally, or simply unclaimed. A higher share of empty homes may mean more housing availability, while a low number can reflect a tighter market with more competition. This, along with the renter-vs.-owner mix, helps paint a clearer picture of what types of housing and services are likely to be available in the area.

Key Biscayne housing costs

Housing costs in Key Biscayne come to a median of $4,001 per month, while tenants specifically pay a median gross rent of $3,501.

Median housing costs per month
$4,001/month
This figure sums up typical monthly housing costs for all households in the area. If you own, it includes mortgage payments in addition to property taxes, insurance and HOA fees. If you rent, it accounts for rent plus extras like utilities. It’s useful for seeing how local living expenses stack up compared to other places.
Median gross rent in Key Biscayne
$3,501/month
Gross rent gives a more complete look at what renters actually pay, including not just base rent, but also utilities and fees. It’s a key number for evaluating rental affordability in your area of interest and understanding how it compares to nearby locations.

Education in Key Biscayne

Key Biscayne education at a glance

About 9% of the population in Key Biscayne went to high school, while 9.5% pursued college studies. Another 5.2% earned an associate degree and 34.1% hold a bachelor’s. Meanwhile, 39.9% went even further, earning a master’s or doctorate.

Education level
Value Percent YoY change
No high school 232 2.3% 11.0%
High school diploma 910 9% -12.6%
College diploma 958 9.5% -18.8%
Associate degree 530 5.2% 13.2%
Bachelor's degree 3,437 34.1% 2.4%
Graduate degree 4,022 39.9% 5.2%
A community’s education mix can offer insights into the local economy and housing market. Higher levels of education often align with more job opportunities and stable incomes, which can increase demand for homes and influence both rent prices and rental availability.

Income in Key Biscayne

How much people earn in Key Biscayne

The average annual household income in Key Biscayne was $309,291 in 2024, the most recent annual data available, according to the U.S. Census Bureau. This marked a +13.2% change from the previous year. At the same time, the median income stood at $181,505, reflecting a +5.2% shift over the same period.

Average household income in Key Biscayne
$309,291/year
13.2% year-over-year change
Median household income in Key Biscayne
$181,505/year
5.2% year-over-year change

Key Biscayne income by age

In Key Biscayne, households led by residents aged 25 to 44 — usually in the early to mid stages of their careers — have a median income of $250,001. Those with someone between 45 and 64 in charge, often well established professionally, earn $250,001 overall. Overall, 94.5% of the locals in this community live above the poverty line.

Income breakdown by age
Value YoY change
25 - 44 $250,001 15.9%
45 - 64 $250,001 5.7%
Over 65 $103,358 21.4%
Above poverty level
13,842
Below poverty level
801
Value Percent YoY
change
Above poverty level 13,842 94.5% 4.1%
Below poverty level 801 5.5% -28.4%

Average renter income in Key Biscayne

To get a better sense of what renters earn on average in Key Biscayne, their median household income was $96,442 according to 2022 Census data. In addition, the rent-to-income ratio in the area, at 43.6%, shows what portion of their earnings goes toward housing expenses.

Renter median household income
$96,442
Rent-to-income ratio
43.6%
Understanding the rent-to-income ratio can help renters gauge if local housing costs align with their earnings. A ratio under 30% usually signals affordability, while exceeding this mark means rent is taking a larger-than-recommended bite out of income. That could make it harder for you to cover other costs like transportation, healthcare, or child care.

Employment in Key Biscayne

Workforce and job types in Key Biscayne

The job market in Key Biscayne is powered by 6,383 working residents, spread across a range of industries and roles. 94.5% of the working population are employed in professional or administrative positions, while 5.5% are in hands-on or service-based jobs. Also, 28.7% run their own businesses, 58.8% are employed by private companies, and 5.5% work in the public sector.

Workforce demographics

Working population
6,383
2.3% year-over-year change
White collar
6,031
Blue collar
352
Value Percent YoY change
White collar 6,031 94.5% 2.9%
Blue collar 352 5.5% -6.9%
Employer type
Self employees
28.7%
Private companies
58.8%
Governmental workers
5.5%
Not for profit companies
6.9%
Value Percent YoY change
Self employees 1,834 28.7% 7.0%
Private companies 3,756 58.8% 0.1%
Governmental workers 352 5.5% -8.8%
Not for profit companies 441 6.9% 14.2%
Unemployment rate
2.8%
-15.4% year-over-year change

Available workforce

The unemployment rate in Key Biscayne stands at 2.8%, representing the share of the workforce currently without a job and actively looking for one.

For renters, the unemployment rate helps paint a picture of job security and financial stability in the area. Rates around 4% to 5% are considered typical. A lower-than-average rate might suggest strong job prospects and a thriving local economy, while a higher rate could hint at fewer opportunities—both useful to consider when planning a move.

Transportation in Key Biscayne

How people get around in Key Biscayne

Commuting methods vary: 56.6% of residents travel by personal vehicle and 2% prefer to walk, while the remaining share relies on public transit or on two wheelers to get from A to B.

Means of transportation
Value Percent YoY change
Car 3,565 56.6% -2.8%
Bus or trolleybus 111 1.8% -9.8%
Subway or elevated 8 0.1% N/A
Motorcycle 72 1.1% -14.3%
Bicycle 16 0.2% -52.9%
Walk 127 2% -8.0%
Understanding how locals get to work can help you plan your own routine. High car usage might mean you’ll need a vehicle, while strong public transit or walkability could save you the hassle. Commute times also play a big role in quality of life—shorter trips can give you more time for the things you enjoy.

What is the median and average household income in Key Biscayne by zipcode?

Zipcode Population Number of households Median income Average income
33149 14,791 4,945 $181,505 $309,291

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FAQs about Key Biscayne demographics 

What is the total population of Key Biscayne?

Key Biscayne has a total population of 14,791 residents, according to the latest release from the U.S. Census Bureau: the 2019-2023 American Community Survey (ACS) 5-year estimates. This figure changed by +1.6% compared to a year ago.

What is the gender ratio in Key Biscayne?

The gender ratio in Key Biscayne is as follows:
  • 49.9% males (7,385 residents)
  • 50.1% females (7,406 residents)

What is the median age in Key Biscayne?

The median age in Key Biscayne is 42.2.

What is the age distribution of the population in Key Biscayne?

The age distribution in Key Biscayne is as follows:
  • Under 15: 24.8% (3,672 residents)
  • Ages 15-24: 11.4% (1,694 residents)
  • Ages 25-44: 17.8% (2,639 residents)
  • Ages 45-64: 30.2% (4,469 residents)
  • Over 65: 15.7% (2,317 residents)

What is the racial and ethnic makeup of Key Biscayne?

The racial and ethnic makeup of Key Biscayne is as follows:
  • White: 36.6% (5,414 residents)
  • Black or African American: 0.8% (116 residents)
  • American Indian and Alaska Native: 0.1% (11 residents)
  • Asian: 0.1% (21 residents)
  • Native Hawaiian and Other Pacific Islander: 0% (0 residents)
  • Two or More Races: 58.7% (8,682 residents)
  • Other: 3.7% (547 residents)

What percentage of the population in Key Biscayne are U.S.-born citizens?

U.S.-born citizens represent 37.3% of the population in Key Biscayne.

How many housing units are there in Key Biscayne?

There are 7,310 housing units in Key Biscayne, reflecting a -2.5% change compared to the previous year, according to the latest data from the U.S. Census Bureau.

How many households are in Key Biscayne and what is the average household size?

Key Biscayne has a total of 4,945 households, with an average of 3 people in each.

What is the median household income in Key Biscayne?

Key Biscayne has a median household income of $181,505, representing a +5.2% shift from the previous year, according to the U.S. Census Bureau.

What is the employment rate and job market overview for Key Biscayne?

The employment rate is 97.2% in Key Biscayne, with a workforce of 6,383 residents. Here’s a detailed breakdown of the local job market:

Job types:
  • White-collar workers: 94.5% (6,031 residents)
  • Blue-collar workers: 5.5% (352 residents)

Places of employment:
  • Self-employed: 28.7% (1,834 residents)
  • Private companies: 58.8% (3,756 residents)
  • Governmental workers: 5.5% (352 residents)
  • Not-for-profit companies: 6.9% (441 residents)

Data source & methodology

The demographic data on this page was sourced from the latest U.S. Census Bureau release—the 2019–2023 American Community Survey (ACS) 5-year estimates.

The information, issued annually, is compiled and published by the Point2Homes Research Team as soon as new data becomes available.

No representation, guarantee, or warranty is made concerning the accuracy or completeness of modified or aggregated information for particular areas.

Page last updated: September 2025