Nestled in the heart of the Florida Keys, Marathon offers the perfect blend of natural beauty, family-friendly vibes, and oceanfront serenity. Known as the "Heart of the Keys," this island is a haven for nature lovers and water enthusiasts, featuring pristine beaches, stunning coral reefs, and the famous Seven Mile Bridge. Whether you're exploring the area's lush wildlife or enjoying the local seafood, Marathon is all about slow-paced island living with a touch of coastal adventure.
1. WHAT TO EXPECT: Crystal-clear waters, laid-back beaches, scenic boat rides, and wildlife encounters in the heart of the Keys.
2. THE LIFESTYLE: Fishing, kayaking, eco-tours, family outings, and the perfect spot for unwinding by the sea.
3. YOU'LL LOVE: The relaxed vibe, secluded beaches, charming local shops, and access to some of the best diving and snorkeling in the region.
4. THE MARKET: Waterfront homes, cozy beach cottages, and peaceful retreats in a close-knit, island community.
5. DON’T EXPECT: Busy tourist crowds or fast-paced city life—Marathon is for those who seek tranquility and a deep connection with nature.
10,423 people live in Marathon, where the median age is 49.8 and the average individual income is $46,301. Data provided by the U.S. Census Bureau.
Total Population
Median Age
Population Density Population Density This is the number of people per square mile in a neighborhood.
Average individual Income
Marathon has 4,299 households, with an average household size of 2.38. Data provided by the U.S. Census Bureau. Here’s what the people living in Marathon do for work — and how long it takes them to get there. Data provided by the U.S. Census Bureau. 10,423 people call Marathon home. The population density is 1,148.13 and the largest age group is Data provided by the U.S. Census Bureau.
Total Population
Population Density Population Density This is the number of people per square mile in a neighborhood.
Median Age
Men vs Women
Population by Age Group
0-9 Years
10-17 Years
18-24 Years
25-64 Years
65-74 Years
75+ Years
Education Level
Total Households
Average Household Size
Average individual Income
Households with Children
With Children:
Without Children:
Marital Status
Blue vs White Collar Workers
Blue Collar:
White Collar:
We are here to guide you through buying, selling, or renting your ideal home with expert advice and local insight. Let's make your real estate journey seamless and successful!
