Duck Key is a community in Monroe County, Florida, home to about 647 people across 0.6 square miles. It has no ZIP code of its own: it’s part of 33050.
Homes sold for a median of $686 per square foot in the three months ending August 2026, a buyer’s market.
Mostly Marathon; part is in Duck Key
Each card is that ZIP code’s whole market, including any part outside Duck Key. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Duck Key’s story and what everyday life there is like, for people thinking about moving in.
Are you a local agent who knows Duck Key well? Agents who advertise here will be able to write the guide. Advertise on OfferBacked
| Nearest major airport | Miami International Airport (MIA)87 miles away |
|---|---|
| Closer regional airport | Key West International Airport (EYW)47 miles away |
| Nearest city of 250,000+ | Miami, FL89 miles away |
Straight-line distances from the center of Duck Key; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Duck Key had 727 residents in the 2020 census, up 64% since 2000.
It’s the 831st largest of 954 towns in Florida by population.
Monroe County grew from 18,006 residents in 1900 to 82,874 in 2020.
Monroe County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 92°F in summer, and winter lows average 64°F. About 39.7 inches of rain and melted snow fall in a typical year.
Source: NOAA 1991–2020 climate normals, Marathon Ap, FL weather station (about a mile away).
37,134 jobs at 4,154 businesses in Monroe County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
131 doctors and other health care providers list an office in Duck Key.
Nearest hospitals
Providers with an office here
| Primary care doctors | 14 |
|---|---|
| Specialist doctors | 26 |
| Dentists | 10 |
| Nurse practitioners and physician assistants | 24 |
| Mental health providers | 44 |
| Physical and occupational therapists | 7 |
| Optometrists | 4 |
| Chiropractors | 2 |
| Pharmacies | 4 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (1 nearby)
Grocery stores
Pharmacies (1 nearby)
Libraries
Museums
Counts are within about 1 mile of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Public schools here are run by Monroe. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Stanley Switlik Elementary SchoolMarathon | Pre-K–5 | 602 | Public | 3.7 mi |
| Marathon SchoolMarathon | 6–12 | 809 | Public | 3.0 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools. Listed by address; we don’t rate schools.
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Shares ZIP codes with Marathon.
Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.