Neighborhood · Marathon, Florida
Key Colony Beach 1st Addition
Small-scale island living on the Middle Keys waterfront
2
Homes for sale
$874,498
Median list price
$900
Avg price / sqft
135
Median days on market
Key Colony Beach 1st Addition sits in the compact, tidy world of Marathon's island communities, where a 971-square-foot home is closer to the water than most places in the Keys ever get. Both of the current listings here are waterfront, which tells you everything about what people come for: canal access, an easy launch, and mornings that start on the dock. Families put down roots near Marathon School and Stanley Switlik Elementary School, and the whole neighborhood keeps that quiet, residential feel.
The market reality is that this is a thin, high-value pocket — just two active listings today, with a median list price of $874,498 and the range running from $849,000 to $899,995. The single sale in the past year closed at $1,250,000, and sellers here are getting about 96% of asking, so there's little room for lowball offers. Inventory moves slowly, with a median 135 days on market, so patient buyers who watch the live map and the wider Marathon homes for sale will have the advantage.
Key Colony Beach 1st Addition is a community in Marathon, Florida.
Quick facts
$849,000 – $900K price range
971 sqft median home
1 sold in 12 months
On the market now
Homes for sale in Key Colony Beach 1st Addition
$899,995
410 10th St, Key Colony FL 33051, KEY COLONY
2 bd · 2 ba · 990 sqft
$849,000
151 10th St, Marathon FL 33051, MARATHON
2 bd · 2 ba · 952 sqft
Every active listing inside the Key Colony Beach 1st Addition boundary
Open full map search →Find your fit
Browse Key Colony Beach 1st Addition
By feature — on the live map
The numbers that matter
The Key Colony Beach 1st Addition market
1
Sold, last 12 months
$1,250,000
Median sold price
96%
Sale-to-list ratio
What sellers actually get vs asking
39 days
Median time to sell
Key Colony Beach 1st Addition vs Marathon
Median list price
Price per sqft
Days on market
Live Stellar MLS data — every listing and closed sale inside the Key Colony Beach 1st Addition boundary. Rolling medians smooth single-month swings in small communities.
For the school run
Schools Key Colony Beach 1st Addition is zoned for
Attendance boundaries overlapping this community — always verify zoning with the district.
What it really costs
Owning here
Owning the median Key Colony Beach 1st Addition home
≈ $5,398/mo
$874,498 median · 20% down · 30-yr fixed at 6.9% · taxes/HOA from live listing data · insurance is a Florida estimate.
Population
231
Median age
75
Median income
$116,875
Median home value
$1,136,900
Beyond the listings
Living in Key Colony Beach 1st Addition
Hobbies & Interests
Top 11% in the U.S.Wanderlust
Always thinking about their next destination, this population loves exploring new places abroad or right in their own backyard. They hold onto past trips by sharing their favorite memories and pictures year round.
Culture
Top 13% in the U.S.Sites to See
This population finds the most beautiful sites just by looking up. Sunrise, sunset or sometime in between, these people love to marvel at man-made and natural wonders.
Lifestyles
Top 16% in the U.S.Wealth Signaling
Interested in the finer things life has to offer, this population wants to display their lifestyle by discussing luxury products. Often references jewelry, cars, and home features.
Relationships
Happily Ever After
Whether it's the stress of wedding planning or looking back on that special day, this population has their eyes and hearts focused on lifelong commitment.
Beliefs
Local Engagement
These citizens want to make their neighborhood a better, more beautiful place to live. They're attentive to the needs and affairs of the local community.
Entertainment
Live & Local Music
This population follows the music. From local bands to current acts at the local venue, you can find these people researching band tours and how to get backstage passes.
Straight answers
Key Colony Beach 1st Addition FAQs
Is Key Colony Beach 1st Addition a good place to live?+
It's a small, waterfront-oriented pocket of Marathon where both current listings sit on the water — ideal if canal access and dock life are priorities. Families benefit from assignment to Marathon School and Stanley Switlik Elementary, and the compact scale keeps it quiet and residential.
Is it expensive to buy here?+
Yes — the median list price is $874,498 and homes average $900 per square foot, which is firmly in Keys-waterfront territory. The one home sold in the last 12 months closed at $1,250,000, so this is a high-value neighborhood rather than an entry-level one.
What do homes cost in Key Colony Beach 1st Addition?+
Right now the two active listings range from $849,000 to $899,995, with a median around $874,498 on a typical home size of 971 square feet. You can track current pricing and availability on the live map as inventory shifts.
How is the market here?+
It's thin and slow-moving, with just two active listings and a median 135 days on market. Sellers are holding firm — they've been getting about 96% of asking — so serious buyers should come prepared rather than expecting deep discounts. Watching the broader Marathon homes for sale can help you gauge relative value.
What about HOA fees and property taxes?+
HOA data isn't available for this neighborhood, so budget expectations should be confirmed listing by listing. Property taxes run a median of about $6,955 per year, which is a meaningful line item to factor into your carrying costs.
Neighborhood boundary by edgeAI; listings matched to the polygon. IDX information is provided exclusively for consumers’ personal, non-commercial use and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. Data is deemed reliable but is not guaranteed accurate by Stellar MLS.
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