Neighborhood · Marathon, Florida
Key Colony Beach 1st Addition
A compact waterfront enclave in the Middle Keys
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 heart of the Middle Keys, a small waterfront pocket where the appeal is proximity to the water and the easygoing rhythm of island living. Homes here run modest in footprint — the median is around 971 square feet — so the value is in the location, not the square footage. It's the kind of neighborhood where boaters and second-home buyers gravitate, close to fellow Marathon communities like Marathon Shores and Key Colony Beach 2nd Addition.
For a buyer today, this is a thin, high-priced market. There are just 2 active listings, both waterfront, with a median list price near $874,498 and asking prices topping $900 per square foot. Only one home sold in the past year, at $1,250,000, and sellers here have been holding firm — collecting about 96% of asking. If you're weighing options, it's worth comparing against the broader pool of Marathon homes for sale and watching the live map for new inventory.
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 strong fit if you want a small waterfront community in the Middle Keys with easy access to boating and the rest of Marathon. Both active listings are waterfront, and you're close to established neighborhoods like Marathon Shores. It suits second-home buyers and boaters more than those needing lots of interior space.
Is it expensive to buy here?+
Yes — this is a premium waterfront market. The median list price is about $874,498, and asking prices run near $900 per square foot, with the one home sold in the past year closing at $1,250,000. Compact home sizes keep total prices lower than the per-foot number suggests.
What do homes cost in Key Colony Beach 1st Addition?+
The two current listings range from $849,000 to $899,995, with a median around $874,498. Homes are small — roughly 971 square feet at the median — so you're paying for the waterfront location, not the footprint. For comparison, browse nearby Key Colony Beach 2nd Addition.
How is the market right now?+
It's tight and slow-moving. There are just 2 active listings, only one home sold in the last 12 months, and the median time on market is about 135 days. Sellers are getting roughly 96% of asking, so there's modest room to negotiate but no fire sales.
What about HOA fees and property taxes?+
HOA data isn't reported for this neighborhood, so expect fees to vary by property. The median annual property tax runs about $6,955, which is worth budgeting for alongside Keys insurance costs.
Keep exploring
More Marathon neighborhoods
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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