Marathon, FL Demographics

A map of Marathon's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	5,902	6,058	59.5%	62.5%
Hispanic	3,395	2,904	34.2%	30.0%
Multiracial	353	230	3.6%	2.4%
Black	210	365	2.1%	3.8%
Asian	34	84	0.3%	0.9%
Native American/Other	20	48	0.2%	0.5%

Marathon, Florida has an estimated population of 9,914, a slight increase from the 9,689 recorded in the 2020 Census. The population is 59.5% White, 34.2% Hispanic, 3.6% Multiracial, 2.1% Black, 0.3% Asian, and 0.2% Native American/Other. This demographic dot map shows the population of Marathon, with one dot drawn for each person counted by the Census, color-coded by race.

Marathon has become slightly more racially diverse since the 2020 Census. It is considerably less diverse than Florida overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In Marathon, that probability was 51.7% in 2020 and 52.7% in the most recent ACS estimates.

Marathon is ranked the 350th most populous place in Florida, out of 956 places. This ranking is based on the Census definition of a place, which includes incorporated places like cities, towns, and villages, as well as unincorporated census-designated places (CDPs). Marathon was ranked the 346th most populous place in the 2020 Census.

Marathon's White Population

5,902 residents of Marathon, or 59.5% of the population, identify as White. The share of White residents in Marathon is higher than in Florida overall, where 50.4% of the population is White. Marathon ranks 550th statewide in terms of White residents as a share of the population, out of 956 places.

Since the 2020 Census, Marathon's White population has declined by an estimated 2.6%. White residents' share of Marathon's population has decreased from 62.5% to 59.5%.

Marathon is less White than neighboring Key Colony Beach (90.6% White), Duck Key (81.3% White), Layton (84.7% White), Big Pine Key (85.7% White), and Cudjoe Key (84.6% White).

Marathon's Black Population

210 residents of Marathon, or 2.1% of the population, identify as Black. The share of Black residents in Marathon is considerably lower than in Florida overall, where 14.6% of the population is Black. Marathon ranks 562nd statewide in terms of Black residents as a share of the population, out of 956 places.

Since the 2020 Census, Marathon's Black population has declined by an estimated 42.5%. Black residents' share of Marathon's population has decreased from 3.8% to 2.1%.

Marathon is more Black than neighboring Key Colony Beach (0% Black), Layton (0% Black), Big Pine Key (0.4% Black), and Cudjoe Key (0% Black). Marathon is less Black than neighboring Duck Key (10.4% Black).

Marathon's Asian Population

34 residents of Marathon, or 0.3% of the population, identify as Asian. The share of Asian residents in Marathon is slightly lower than in Florida overall, where 2.9% of the population is Asian. Marathon ranks 619th statewide in terms of Asian residents as a share of the population, out of 956 places.

Since the 2020 Census, Marathon's Asian population has declined by an estimated 59.5%. Asian residents' share of Marathon's population has decreased from 0.9% to 0.3%.

Marathon is more Asian than neighboring Key Colony Beach (0% Asian), and Layton (0% Asian). Marathon is less Asian than neighboring Duck Key (1.4% Asian), Big Pine Key (1.2% Asian), and Cudjoe Key (0.6% Asian).

Marathon's Hispanic Population

3,395 residents of Marathon, or 34.2% of the population, identify as Hispanic. The share of Hispanic residents in Marathon is higher than in Florida overall, where 27.4% of the population is Hispanic. Marathon ranks 193rd statewide in terms of Hispanic residents as a share of the population, out of 956 places.

Since the 2020 Census, Marathon's Hispanic population has grown by an estimated 16.9%. Hispanic residents' share of Marathon's population has increased from 30.0% to 34.2%.

Marathon is more Hispanic than neighboring Key Colony Beach (9.4% Hispanic), Duck Key (5.7% Hispanic), Layton (15.3% Hispanic), Big Pine Key (8.2% Hispanic), and Cudjoe Key (11.8% Hispanic).

Marathon's Native American/Other Population

20 residents of Marathon, or 0.2% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Marathon is comparable to the share in Florida overall, where 0.8% of the population is Native American/Other. Marathon ranks 729th statewide in terms of Native American/Other residents as a share of the population, out of 956 places.

Since the 2020 Census, Marathon's Native American/Other population has declined by an estimated 58.3%. Native American/Other residents' share of Marathon's population has remained roughly unchanged at 0.2%.

Marathon is more Native American/Other than neighboring Key Colony Beach (0% Native American/Other), Duck Key (0% Native American/Other), Layton (0% Native American/Other), Big Pine Key (0% Native American/Other), and Cudjoe Key (0% Native American/Other).

Marathon's Multiracial Population

353 residents of Marathon, or 3.6% of the population, identify as Multiracial. The share of Multiracial residents in Marathon is comparable to the share in Florida overall, where 3.8% of the population is Multiracial. Marathon ranks 747th statewide in terms of Multiracial residents as a share of the population, out of 956 places.

Since the 2020 Census, Marathon's Multiracial population has grown by an estimated 53.5%. Multiracial residents' share of Marathon's population has increased from 2.4% to 3.6%.

Marathon is more Multiracial than neighboring Key Colony Beach (0% Multiracial), Duck Key (1.2% Multiracial), Layton (0% Multiracial), and Cudjoe Key (2.9% Multiracial). Marathon is less Multiracial than neighboring Big Pine Key (4.5% Multiracial).

Sources: Most recent population estimates are from the 2020-2024 American Community Survey 5-Year Estimates. 2020 population counts and map data are from 2020 Census State Redistricting Data. Geographic data are from Census TIGER/Line Shapefiles.