Monroe County, FL Cell Phone Coverage Map & Network Rankings (2026)

Find the best cell phone network and plan to use in Monroe County, FL

Coverage rankings for Monroe County, FL

T-Mobile currently ranks first for coverage in this area, with a coverage score of 37.4. Compare Wireless Carriers uses FCC broadband map data to estimate and calculate coverage scores. More on that further below.

RankCarrierScoreOverall4G LTE5GFast 5GAverage Signal
1T-Mobile37.428.7%28.7%27.1%20.0% -90 dBm
2AT&T34.141.5%41.2%22.3%13.4% -113 dBm
3Verizon31.941.7%41.7%8.4%4.8% -102 dBm

Scores include coverage area, network type, and average signal strength.

Cell phone coverage map for Monroe County, FL

Zoom in for local detail. Tap or click a colored area to see coverage and signal details. On mobile, use two fingers to move the map.

Coverage Key
Less covered More covered
Darker areas mean the carrier covers more of that location.

Map data © OpenStreetMap contributors, © CARTO. Rendered with MapLibre. FCC BDC mobile coverage processed by Compare Wireless Carriers.

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Cell phone coverage by network in Monroe County, FL

#1

T-Mobile

Coverage Score 37.4
In Monroe County, FL
Overall
28.7%
4G LTE
28.7%
5G
27.1%
Fast 5G
20.0%
Average Signal -90 dBm
#2

AT&T

Coverage Score 34.1
In Monroe County, FL
Overall
41.5%
4G LTE
41.2%
5G
22.3%
Fast 5G
13.4%
Average Signal -113 dBm
#3

Verizon

Coverage Score 31.9
In Monroe County, FL
Overall
41.7%
4G LTE
41.7%
5G
8.4%
Fast 5G
4.8%
Average Signal -102 dBm
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Coverage by city in Monroe County, FL

Cities and towns are shown for county-level comparison. Coverage percentages use land-area only coverage.

CityVerizonAT&TT-Mobile
Big Coppitt Key, FL 100.0% 100.0% 94.4% 83.3% -88 dBm 88.9% 88.9% 88.9% 75.0% -100 dBm 94.4% 94.4% 94.4% 94.4% -71 dBm
Big Pine Key, FL 100.0% 100.0% 83.5% 55.9% -93 dBm 90.4% 82.0% 84.6% 21.7% -101 dBm 88.2% 88.2% 87.1% 75.4% -85 dBm
Cudjoe Key, FL 100.0% 100.0% 90.0% 73.6% -88 dBm 97.9% 97.9% 94.3% 42.1% -110 dBm 97.9% 97.9% 97.1% 95.0% -78 dBm
Duck Key, FL 100.0% 100.0% 73.3% 26.7% -96 dBm 100.0% 100.0% 100.0% 60.0% -111 dBm 100.0% 100.0% 100.0% 86.7% -92 dBm
Islamorada, FL 100.0% 100.0% 51.8% 36.0% -89 dBm 99.4% 99.4% 97.6% 76.2% -101 dBm 98.2% 98.2% 98.2% 98.2% -76 dBm
Islamorada, Village of Islands, FL 100.0% 100.0% 42.2% 31.7% -87 dBm 99.4% 99.4% 98.3% 79.4% -98 dBm 99.4% 99.4% 99.4% 99.4% -77 dBm
Key Colony Beach, FL 100.0% 100.0% 100.0% 81.8% -94 dBm 100.0% 100.0% 90.9% 36.4% -104 dBm 100.0% 100.0% 100.0% 100.0% -69 dBm
Key Largo, FL 100.0% 100.0% 51.3% 32.2% -90 dBm 98.8% 98.8% 98.0% 55.1% -104 dBm 98.8% 96.8% 98.8% 93.3% -80 dBm
Key West, FL 100.0% 100.0% 97.4% 85.8% -79 dBm 98.7% 98.7% 83.9% 38.1% -97 dBm 99.4% 99.4% 99.4% 99.4% -70 dBm
Layton, FL 100.0% 100.0% 20.0% 0.0% -70 dBm 100.0% 100.0% 100.0% 100.0% -86 dBm 100.0% 100.0% 100.0% 100.0% -60 dBm
Long Key, FL 100.0% 100.0% 34.6% 0.0% -85 dBm 98.1% 98.1% 98.1% 78.8% -96 dBm 98.1% 98.1% 98.1% 98.1% -69 dBm
Marathon, FL 100.0% 100.0% 92.3% 83.3% -86 dBm 93.7% 93.7% 89.6% 64.9% -99 dBm 93.7% 93.7% 93.7% 93.7% -75 dBm
North Key Largo, FL 100.0% 100.0% 50.8% 33.9% -93 dBm 98.2% 98.2% 85.2% 41.6% -111 dBm 99.2% 99.2% 99.2% 90.1% -85 dBm
Stock Island, FL 100.0% 100.0% 95.8% 83.3% -84 dBm 91.7% 91.7% 58.3% 25.0% -93 dBm 95.8% 95.8% 95.8% 95.8% -66 dBm
Summerland Key, FL 98.7% 98.7% 69.8% 30.4% -96 dBm 96.8% 96.8% 92.9% 53.4% -107 dBm 95.6% 95.6% 95.3% 86.5% -86 dBm
Tavernier, FL 100.0% 100.0% 15.2% 4.5% -87 dBm 98.5% 98.5% 90.9% 57.6% -93 dBm 98.5% 98.5% 98.5% 98.5% -78 dBm

About The Coverage Data

Coverage and signal estimates are derived by Compare Wireless Carriers from carrier-reported data in the FCC’s National Broadband Coverage Map, last updated in June 2025. “Percent covered” shows how much of the city or ZIP code area has a carrier signal, whether weak or strong. Signal bars show the estimated average signal strength in areas of Monroe County, FL where that carrier has coverage.

If a carrier says you should have service but you do not, run a challenge test with the FCC Mobile Speed Test App. The FCC uses those results to check carrier-submitted coverage data and requires a carrier response when enough tests show a pattern of inaccurate coverage reporting.