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2026 Compare Cities People:
Key Biscayne, FL vs Fisher Island, FL

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Highlights
- Fisher Island is 0% more densely populated than Key Biscayne.
- People are 38.5% more likely to be married in Fisher Island.
- The Median Age is 25.9 years older in Fisher Island.
 Key Biscayne, FLFisher Island, FLUnited States
 Population  Unlock484329,725,481
 Female Population51.3%  Unlock50.5%
 Male Population48.7%  Unlock49.5%
 Median Age  Unlock67.638.4
 space3
 Population - 201012,389  Unlock309,327,143
 Population - 2000  Unlock467285,036,114
 Population - 19908,854  Unlock251,960,433
 Pop. 2000 to Now  Unlock-82.4%15.6%
 Pop. 1990 to Now43.8%  Unlock30.8%
 space4
 Population Density  Unlock2,008.393.4
 Land Area1.2  Unlock3,531,905.4
 Water Area  Unlock0.0264,836.8
 space
 Est. Total Population By Age
 Key Biscayne, FLFisher Island, FLUnited States
 Age 0 to 44.4%  Unlock5.9%
 Age 5 to 9  Unlock4.5%6.1%
 Age 10 to 1413.9%  Unlock6.6%
 Age 15 to 17  Unlock0.0%3.9%
 Age 18 to 202.4%  Unlock4.0%
 Age 21 to 24  Unlock0.0%5.2%
 Age 25 to 344.0%  Unlock13.8%
 Age 35 to 44  Unlock6.4%12.9%
 Age 45 to 5420.9%  Unlock12.6%
 Age 55 to 59  Unlock5.0%6.7%
 Age 60 to 644.8%  Unlock6.3%
 Age 65 to 74  Unlock36.4%9.6%
 Age 75 to 845.6%  Unlock4.5%
 Age 85 and over  Unlock6.6%1.9%
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 Race
 Key Biscayne, FLFisher Island, FLUnited States
 White23.4%  Unlock59.4%
 Black  Unlock0.0%12.2%
 Asian0.2%  Unlock5.6%
 Native American  Unlock0.0%0.6%
 Hawaiian, Pacific Islander0.1%  Unlock0.2%
 Other  Unlock0.0%0.4%
 Two or More Races1.6%  Unlock3.2%
 Hispanic  Unlock12.0%18.4%
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 Marriage & Family
 Key Biscayne, FLFisher Island, FLUnited States
 Married Population59.0%  Unlock49.8%
     Currently Married  Unlock81.7%48.0%
 Married but Separated0.3%  Unlock1.8%
 Single Population  Unlock18.3%50.2%
 Never Married29.0%  Unlock33.8%
 Divorced  Unlock18.3%10.8%
 Widowed4.5%  Unlock5.6%
 space5
 Household Size  Unlock2.162.60
 Households4,580  Unlock124,010,992
 Family Households  Unlock16580,755,759
     Married couple, w/children52.9%  Unlock30.5%
     Married couple, no children  Unlock80.6%42.9%
 Non Family Households996  Unlock43,255,233
     Single householder, w/children  Unlock0.0%15.8%
     Single householder, no children5.8%  Unlock10.8%
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Learn More About Key Biscayne, Florida
Overview
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Learn More About Fisher Island, Florida
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