Marathon, FL Profile: Facts & Data


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Marathon, Florida - Basic Facts

Real Estate Resources

The City of Marathon had a population of 8,713 as of July 1, 2018.

The primary coordinate point for Marathon is located at latitude 24.7323 and longitude -81.0251 in Monroe County. The formal boundaries for the City of Marathon (see map below) encompass a land area of 8.44 sq. miles and a water area of 0.83 sq. miles. Monroe County is in the Eastern time zone (GMT -5). The elevation is 3 feet.

The City of Marathon (GNIS ID: 2405014) has a C1 Census Class Code which indicates an active incorporated place that does not serve as a county subdivision equivalent. It also has a Functional Status Code of "A" which identifies an active government providing primary general-purpose functions.

Florida is one of 20 states where Census County Divisions (CCDs) are used for statistical tracking of subdivisions within each county. The City of Marathon is located within Middle Keys CCD of Monroe County.

Beneath the boundary map are tables with Marathon population, income and housing data, five-year growth projections and peer comparisons for key demographic data. The estimates are for July 1, 2018.

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Marathon, FL Data & Demographics (As of July 1, 2018)


Total Population 8,713
Population in Households 8,536
Population in Familes 6,061
Population in Group Qrtrs 177
Population Density1 1,032
Diversity Index2 55


Median Household Income $54,183
Average Household Income $84,679
Per Capita Income $38,123


Total Housing Units 6,614 (100%)
Owner Occupied HU 2,045 (30.9%)
Renter Occupied HU 1,823 (27.6%)
Vacant Housing Units 2,746 (41.5%)
Median Home Value $419,345
Average Home Value $489,249


Total Households 3,868
Average Household Size 2.21
Family Households 2,267
Average Family Size 3
  1. Population Density = Total Population per square mile.
  2. The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different race or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.


2010-2017 2017-2022
Population 0.59% 0.08%
Households 0.48% 0.06%
Families 0.28% -0.05%
Median Household Income   1.65%
Per Capita Income   2.42%

Marathon, FL - Peer Comparisons by Rank and Percentile

The table below compares Marathon to the other 919 incorporated cities, towns and CDPs in Florida by rank and percentile using July 1, 2018 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description Rank Percentile
Total Population # 352 62nd
Population Density # 580 37th
Diversity Index # 356 61st
Median Household Income # 346 62nd
Per Capita Income # 205 78th

Additional comparisons and rankings can be made with a VERY EASY TO USE Florida Census Data Comparison Tool.

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