Key Biscayne, FL vs Miami, FL
Side-by-side comparison · Updated Sep 2026
Report card
| Category | Key BiscayneKey Biscayne, FL | MiamiMiami, FL | Same grade |
|---|---|---|---|
| ReloScoreOverall grade | |||
| Affluence | Great | Average | |
| Cost of Living | |||
| Crime | Very Safe | Elevated | |
| Education | |||
| Quality of Life | Great | Average | |
| Sovereignty | Self-Reliant | Self-Reliant | Same |
| Strategic | High Risk | High Risk | Same |
Grades rate each place against all US places. How grades work →
Comparison summary
At $172,604, the median household income in Key Biscayne, FL is 2.9 times higher than the $59,390 in Miami, FL, according to 2023 Census figures. This income gap is reflected in the cost of living, with Key Biscayne's cost-of-living index of 356 (98th percentile) being 2.3 times higher than Miami's 153 (79th percentile). The poverty rate also diverges sharply: Miami's 19.2% is 11.5 percentage points higher than Key Biscayne's 7.7%, placing Miami in the 80th percentile for poverty and Key Biscayne in the 29th.
Crime rates differ substantially between the two locations. Key Biscayne reports 7 violent crimes per 100,000 people (3rd percentile), while Miami reports 358 per 100,000 (72nd percentile), a difference of 352 more in Miami. Property crime follows a similar pattern: Key Biscayne's rate of 388 per 100,000 (7th percentile) is far lower than Miami's 2,243 per 100,000 (82nd percentile), which is 5.8 times higher. The educational attainment also shows a wide gap, with 74.4% of adults in Key Biscayne holding a bachelor's degree or higher (96th percentile), compared to 35.6% in Miami (58th percentile), a 38.8 percentage point difference.
Population and household composition also contrast. Miami's population of 446,663 is 432,103 larger than Key Biscayne's 14,560, placing Miami in the 98th percentile and Key Biscayne in the 38th. The average household size in Key Biscayne is 2.9 (88th percentile), 27% larger than Miami's 2.3 (31st percentile). Despite these differences, both places share identical figures for several metrics, including a 2.4% unemployment rate, an air quality index of 48, and an F grade for national disaster risk.
AI-generated and may contain mistakes. Verify any details that matter before acting on them. Generated Oct 2026.
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Where they differ most
Cost of living
| Metric | Key Biscayne, FL | Miami, FL | Difference |
|---|---|---|---|
| COL indexCost of living index (100 = US) | 35698th pctl | 15379th pctl | Cost of living index (100 = US): Key Biscayne, FL 356; Miami, FL 153; Key Biscayne is 2.3 times higher. |
| Home valueMedian home value | $1,238,70097th pctl | $475,20081st pctl | Median home value: Key Biscayne, FL $1,238,700; Miami, FL $475,200; Key Biscayne is 2.6 times higher. |
| Median rent | $3,501100th pctl | $1,65778th pctl | Median rent: Key Biscayne, FL $3,501; Miami, FL $1,657; Key Biscayne is 2.1 times higher. |
| Household incomeMedian household income | $172,60496th pctl | $59,39029th pctl | Median household income: Key Biscayne, FL $172,604; Miami, FL $59,390; Key Biscayne is 2.9 times higher. |
| Comfortable (single)Comfortable income (single) | $240,65898th pctl | $92,32382nd pctl | Comfortable income (single): Key Biscayne, FL $240,658; Miami, FL $92,323; Key Biscayne is 2.6 times higher. |
| Comfortable (family)Comfortable income (family of 4) | $353,76798th pctl | $135,71582nd pctl | Comfortable income (family of 4): Key Biscayne, FL $353,767; Miami, FL $135,715; Key Biscayne is 2.6 times higher. |
| AffordabilityHousing affordability | Unaffordable | Unaffordable | About the same |
Housing-adjusted salary
the same housing budget in Miami needs about
$32,200
Based only on local housing costs and incomes (cost-of-living index 356 vs 153). Leaves out taxes, groceries and transport. How it works →
Data: U.S. Census ACS 5-year, ReloMaps cost-of-living index (2023–2024).
Jobs & income
| Metric | Key Biscayne, FL | Miami, FL | Difference |
|---|---|---|---|
| Unemployment | 2.4%5th pctl | 2.4%5th pctl | About the same |
| Job growthJob growth (YoY) | +1.9%74th pctl | +1.9%74th pctl | About the same |
| Per-capita income | $97,32996th pctl | $42,52863rd pctl | Per-capita income: Key Biscayne, FL $97,329; Miami, FL $42,528; Key Biscayne is 2.3 times higher. |
| Poverty rate | 7.7%29th pctl | 19.2%80th pctl | Poverty rate: Key Biscayne, FL 7.7%; Miami, FL 19.2%; Miami is 11.5 points higher. |
| CommuteAverage commute | 23.8 min53rd pctl | 27.3 min75th pctl | Average commute: Key Biscayne, FL 23.8 min; Miami, FL 27.3 min; Miami is 4 minutes longer. |
| Work from home | 31.9%97th pctl | 14.2%67th pctl | Work from home: Key Biscayne, FL 31.9%; Miami, FL 14.2%; Key Biscayne is 17.7 points higher. |
| OpportunityEconomic opportunity | Strong | Stable | Economic opportunity: Key Biscayne, FL A-; Miami, FL C; Key Biscayne is graded higher. |
| Job market | Strong | Strong | About the same |
Data: U.S. Census ACS 5-year, BLS (2023).
Safety
| Metric | Key Biscayne, FL | Miami, FL | Difference |
|---|---|---|---|
| Violent crimeViolent crime per 100k | 73rd pctl | 35872nd pctl | Violent crime per 100k: Key Biscayne, FL 7; Miami, FL 358; Miami is 352 higher. |
| Property crimeProperty crime per 100k | 3887th pctl | 2,24382nd pctl | Property crime per 100k: Key Biscayne, FL 388; Miami, FL 2,243; Miami is 5.8 times higher. |
| 5-yr trendViolent crime, 5-yr trend | Falling | Rising | |
| Crime & safety | Very Safe | Fair | Crime & safety: Key Biscayne, FL A+; Miami, FL C-; Key Biscayne is graded higher. |
| Traffic safety | SafeCounty figure. County-level figure: measured for the surrounding county. | SafeCounty figure. County-level figure: measured for the surrounding county. | About the same |
Data: FBI Crime Data, NHTSA FARS (2025).
Quality of life
| Metric | Key Biscayne, FL | Miami, FL | Difference |
|---|---|---|---|
| Air quality | GreatCounty figure. County-level figure: measured for the surrounding county. | GreatCounty figure. County-level figure: measured for the surrounding county. | About the same |
| ClimateClimate comfort | Sweaty | Sweaty | About the same |
| HealthcareHealthcare access | ExcellentCounty figure. County-level figure: measured for the surrounding county. | ExcellentCounty figure. County-level figure: measured for the surrounding county. | About the same |
| Tap water | Clean | Clean | About the same |
| Power grid | ReliableState figure. State-level figure: the local figure isn't published. | ReliableState figure. State-level figure: the local figure isn't published. | About the same |
| HomesteadingHomesteading potential | Prime | Prime | About the same |
| Disaster riskNational disaster risk | High-Risk | High-Risk | About the same |
3 rows not shown: broadband and local food access aren't available for either place; walkability isn't available for Key Biscayne, FL.
Data: EPA AirData, NOAA NCEI, County Health Rankings, FCC, Geoapify POIs, EPA SDWIS, EIA, OpenStreetMap, FEMA National Risk Index (2022–2024).
Taxes & laws
Both are in Florida, so state taxes and state laws (homeschooling, firearms, property rights) are the same. See Florida →
Strategic location
How exposed each place is to large-scale disruption, based on distance from big cities, likely targets and natural hazards.
| Metric | Key Biscayne, FL | Miami, FL | Difference |
|---|---|---|---|
| Large cityNearest large city | 5 mi4th pctl | 1 mi2nd pctl | Nearest large city: Key Biscayne, FL 5 mi; Miami, FL 1 mi; Key Biscayne is 3.7 times higher. |
| Target proximity | Fair | Weak | Target proximity: Key Biscayne, FL B-; Miami, FL D+; Key Biscayne is graded higher. |
| To borderDistance to international border | 1,078 mi96th pctl | 1,074 mi96th pctl | About the same |
| To coastDistance to coastline | 5 mi6th pctl | 1 mi2nd pctl | Distance to coastline: Key Biscayne, FL 5 mi; Miami, FL 1 mi; Key Biscayne is 3.5 times higher. |
| StrategicStrategic location | High Risk | High Risk | About the same |
Data: ReloMaps strategic assessment.
People
| Metric | Key Biscayne, FL | Miami, FL | Difference |
|---|---|---|---|
| Population | 14,56038th pctl | 446,66398th pctl | Population: Key Biscayne, FL 14,560; Miami, FL 446,663; Miami is 432,103 larger. |
| DensityPopulation density (per sq mi) | 11,67499th pctl | 12,40899th pctl | Population density (per sq mi): Key Biscayne, FL 11,674; Miami, FL 12,408; Miami is 6% higher. |
| Median age | 43.181st pctl | 39.763rd pctl | Median age: Key Biscayne, FL 43.1; Miami, FL 39.7; Key Biscayne is 3.4 years older. |
| Bachelor's+Bachelor's degree or higher | 74.4%96th pctl | 35.6%58th pctl | Bachelor's degree or higher: Key Biscayne, FL 74.4%; Miami, FL 35.6%; Key Biscayne is 38.8 points higher. |
| Household sizeAverage household size | 2.988th pctl | 2.331st pctl | Average household size: Key Biscayne, FL 2.9; Miami, FL 2.3; Key Biscayne is 27% larger. |
More about Key Biscayne's residents · Miami's residents
Data: U.S. Census ACS 5-year (2023).
Politics
Information only. Not part of any grade, difference or summary on this page.
| Measure | Key BiscayneKey Biscayne, FL | MiamiMiami, FL |
|---|---|---|
| Cook PVI | R+6 | R+6 |
| 2024 presidential | R +15.0 pts | R +15.0 pts |
Full politics data: Key Biscayne · Miami
Moving between Key Biscayne and Miami
- Median rent: $3,501 in Key Biscayne, $1,657 in Miami
- Median home value: $1,238,700 in Key Biscayne, $475,200 in Miami
- Cost of living index (100 = US): 356 in Key Biscayne, 153 in Miami
- Median household income: $172,604 in Key Biscayne, $59,390 in Miami
- Comfortable income (family of 4): $353,767 in Key Biscayne, $135,715 in Miami
- Unemployment: 2.4% in Key Biscayne, 2.4% in Miami
- Average commute: 23.8 min in Key Biscayne, 27.3 min in Miami
- Violent crime per 100k: 7 in Key Biscayne, 358 in Miami
Weigh these by what matters to you
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- Data: Cost of living: U.S. Census ACS 5-year, ReloMaps cost-of-living index (2023–2024).
- Data: Jobs & income: U.S. Census ACS 5-year, BLS (2023).
- Data: Safety: FBI Crime Data, NHTSA FARS (2025).
- Data: Quality of life: EPA AirData, NOAA NCEI, County Health Rankings, FCC, Geoapify POIs, EPA SDWIS, EIA, OpenStreetMap, FEMA National Risk Index (2022–2024).
- Data: Strategic location: ReloMaps strategic assessment.
- Data: People: U.S. Census ACS 5-year (2023).
* Values derived from national, state, county, city and local statistics and may differ in a specific area.
Narrative content on this page is AI-generated and may contain mistakes. Verify any details that matter before acting on them.
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