Coverage rankings for Jefferson County, NY
AT&T currently ranks first for coverage in this area, with a coverage score of 74.6. Compare Wireless Carriers uses FCC broadband map data to estimate and calculate coverage scores. More on that further below.
| Rank | Carrier | Score | Overall | 4G LTE | 5G | Fast 5G | Average Signal |
|---|---|---|---|---|---|---|---|
| 1 | AT&T | 74.6 | 94.4% | 94.4% | 64.7% | 43.6% | -113 dBm |
| 2 | Verizon | 70.2 | 94.0% | 94.0% | 42.2% | 27.2% | -97 dBm |
| 3 | T-Mobile | 58.3 | 58.1% | 58.0% | 51.5% | 33.0% | -93 dBm |
Scores include coverage area, network type, and average signal strength.
Cell phone coverage map for Jefferson County, NY
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.
Map data © OpenStreetMap contributors, © CARTO. Rendered with MapLibre. FCC BDC mobile coverage processed by Compare Wireless Carriers.
Loading coverage map...
Cell phone coverage by network in Jefferson County, NY
AT&T
- Overall
- 94.4%
- 4G LTE
- 94.4%
- 5G
- 64.7%
- Fast 5G
- 43.6%
Verizon
- Overall
- 94.0%
- 4G LTE
- 94.0%
- 5G
- 42.2%
- Fast 5G
- 27.2%
T-Mobile
- Overall
- 58.1%
- 4G LTE
- 58.0%
- 5G
- 51.5%
- Fast 5G
- 33.0%
Coverage varies by neighborhood. Your carrier shouldn’t.
US Mobile lets you switch between all three major networks, so you can choose the one that works best where you actually use your phone.
Pricing, network access, switching terms, and home internet availability may vary.
Coverage by city in Jefferson County, NY
Cities and towns are shown for county-level comparison. Coverage percentages use land-area only coverage.
| City | Verizon | AT&T | T-Mobile |
|---|---|---|---|
| Adams, NY | 100.0% 100.0% 100.0% 81.3% -90 dBm | 100.0% 100.0% 87.5% 75.0% -117 dBm | 87.5% 87.5% 68.8% 25.0% -101 dBm |
| Adams Center, NY | 100.0% 100.0% 43.8% 11.6% -98 dBm | 100.0% 100.0% 97.3% 75.0% -111 dBm | 89.3% 89.3% 81.3% 49.1% -95 dBm |
| Alexandria Bay, NY | 100.0% 100.0% 100.0% 94.1% -91 dBm | 100.0% 100.0% 100.0% 100.0% -91 dBm | 100.0% 100.0% 100.0% 100.0% -66 dBm |
| Antwerp, NY | 100.0% 100.0% 100.0% 87.0% -80 dBm | 100.0% 100.0% 100.0% 87.0% -94 dBm | 100.0% 100.0% 100.0% 100.0% -70 dBm |
| Belleville, NY | 100.0% 100.0% 21.4% 0.0% -101 dBm | 100.0% 100.0% 28.6% 28.6% -107 dBm | 50.0% 50.0% 14.3% 0.0% -107 dBm |
| Black River, NY | 100.0% 100.0% 77.8% 55.6% -87 dBm | 100.0% 100.0% 100.0% 97.8% -99 dBm | 100.0% 100.0% 100.0% 100.0% -82 dBm |
| Brownville, NY | 100.0% 100.0% 78.6% 57.1% -95 dBm | 100.0% 100.0% 100.0% 35.7% -109 dBm | 100.0% 100.0% 100.0% 71.4% -94 dBm |
| Calcium, NY | 100.0% 100.0% 90.8% 64.6% -89 dBm | 99.2% 99.2% 96.2% 44.6% -104 dBm | 100.0% 100.0% 100.0% 100.0% -76 dBm |
| Cape Vincent, NY | 100.0% 100.0% 100.0% 94.1% -88 dBm | 100.0% 100.0% 100.0% 100.0% -108 dBm | N/A N/A N/A N/A N/A |
| Carthage, NY | 100.0% 100.0% 0.0% 0.0% -85 dBm | 100.0% 100.0% 96.4% 81.8% -102 dBm | 100.0% 100.0% 100.0% 90.9% -86 dBm |
| Chaumont, NY | 100.0% 100.0% 100.0% 95.2% -82 dBm | 100.0% 100.0% 100.0% 100.0% -93 dBm | 4.8% 4.8% 0.0% 0.0% -110 dBm |
| Clayton, NY | 100.0% 100.0% 91.2% 79.4% -89 dBm | 100.0% 100.0% 100.0% 100.0% -109 dBm | 100.0% 100.0% 100.0% 97.1% -79 dBm |
| Deferiet, NY | 93.3% 93.3% 0.0% 0.0% -106 dBm | 100.0% 100.0% 93.3% 53.3% -117 dBm | 26.7% 26.7% 6.7% 6.7% -105 dBm |
| Depauville, NY | 100.0% 100.0% 79.6% 53.0% -95 dBm | 99.6% 98.7% 96.5% 44.3% -107 dBm | 4.3% 4.3% 2.2% 0.0% -105 dBm |
| Dexter, NY | 100.0% 100.0% 100.0% 85.7% -83 dBm | 100.0% 100.0% 100.0% 92.9% -101 dBm | 100.0% 100.0% 100.0% 100.0% -81 dBm |
| Ellisburg, NY | 100.0% 100.0% 66.7% 54.2% -95 dBm | 100.0% 100.0% 45.8% 37.5% -119 dBm | 33.3% 33.3% 12.5% 0.0% -106 dBm |
| Evans Mills, NY | 100.0% 100.0% 100.0% 100.0% -78 dBm | 100.0% 100.0% 100.0% 100.0% -90 dBm | 100.0% 100.0% 100.0% 100.0% -71 dBm |
| Felts Mills, NY | 100.0% 100.0% 0.0% 0.0% -91 dBm | 100.0% 100.0% 100.0% 69.2% -112 dBm | 100.0% 100.0% 100.0% 69.2% -93 dBm |
| Fishers Landing, NY | 100.0% 100.0% 100.0% 63.6% -94 dBm | 81.8% 81.8% 81.8% 81.8% -106 dBm | 81.8% 81.8% 81.8% 81.8% -89 dBm |
| Fort Drum, NY | 100.0% 100.0% 82.1% 56.1% -89 dBm | 100.0% 100.0% 100.0% 80.0% -98 dBm | 98.5% 98.5% 96.1% 84.5% -87 dBm |
| Glen Park, NY | 100.0% 100.0% 93.8% 87.5% -89 dBm | 100.0% 100.0% 100.0% 75.0% -102 dBm | 100.0% 100.0% 100.0% 100.0% -88 dBm |
| Great Bend, NY | 100.0% 100.0% 61.0% 47.8% -92 dBm | 100.0% 100.0% 96.3% 80.1% -102 dBm | 96.3% 95.6% 93.4% 81.6% -86 dBm |
| Henderson, NY | 100.0% 100.0% 0.0% 0.0% -94 dBm | 100.0% 100.0% 91.7% 91.7% -112 dBm | 25.0% 25.0% 8.3% 0.0% -107 dBm |
| Henderson Harbor, NY | 100.0% 100.0% 10.0% 4.0% -92 dBm | 100.0% 100.0% 98.0% 90.0% -100 dBm | 10.0% 10.0% 8.0% 2.0% -102 dBm |
| Herrings, NY | 100.0% 100.0% 0.0% 0.0% -107 dBm | 100.0% 100.0% 66.7% 0.0% -120 dBm | 33.3% 33.3% 33.3% 0.0% -100 dBm |
| La Fargeville, NY | 100.0% 100.0% 75.7% 51.4% -91 dBm | 100.0% 100.0% 64.9% 52.7% -113 dBm | 89.2% 89.2% 77.0% 37.8% -98 dBm |
| Lorraine, NY | 100.0% 100.0% 100.0% 100.0% -77 dBm | 100.0% 100.0% 0.0% 0.0% -120 dBm | N/A N/A N/A N/A N/A |
| Mannsville, NY | 100.0% 100.0% 100.0% 70.0% -94 dBm | 100.0% 100.0% 100.0% 95.0% -99 dBm | 100.0% 100.0% 100.0% 100.0% -82 dBm |
| Natural Bridge, NY | 100.0% 100.0% 33.3% 16.7% -94 dBm | 100.0% 100.0% 100.0% 96.7% -100 dBm | 100.0% 100.0% 100.0% 90.0% -88 dBm |
| Oxbow, NY | 100.0% 100.0% 0.0% 0.0% -96 dBm | 100.0% 100.0% 87.5% 75.0% -119 dBm | N/A N/A N/A N/A N/A |
| Pamelia Center, NY | 100.0% 100.0% 100.0% 96.6% -86 dBm | 100.0% 100.0% 100.0% 93.1% -98 dBm | 100.0% 100.0% 100.0% 100.0% -80 dBm |
| Philadelphia, NY | 100.0% 100.0% 61.9% 42.9% -103 dBm | 100.0% 100.0% 9.5% 4.8% -103 dBm | 100.0% 100.0% 100.0% 100.0% -80 dBm |
| Pierrepont Manor, NY | 100.0% 100.0% 41.2% 23.5% -95 dBm | 100.0% 100.0% 58.8% 41.2% -115 dBm | 94.1% 94.1% 88.2% 35.3% -97 dBm |
| Plessis, NY | 100.0% 100.0% 37.5% 0.0% -105 dBm | 100.0% 100.0% 100.0% 50.0% -118 dBm | 100.0% 100.0% 100.0% 12.5% -99 dBm |
| Redwood, NY | 100.0% 100.0% 90.9% 72.7% -85 dBm | 100.0% 100.0% 95.5% 65.9% -113 dBm | 100.0% 100.0% 93.2% 45.5% -96 dBm |
| Rodman, NY | 100.0% 100.0% 100.0% 100.0% -80 dBm | 100.0% 100.0% 100.0% 100.0% -103 dBm | N/A N/A N/A N/A N/A |
| Sackets Harbor, NY | 100.0% 100.0% 98.1% 90.4% -83 dBm | 100.0% 100.0% 55.8% 51.9% -107 dBm | 98.1% 98.1% 98.1% 98.1% -74 dBm |
| Theresa, NY | 100.0% 100.0% 0.0% 0.0% -81 dBm | 96.7% 96.7% 33.3% 0.0% -119 dBm | 93.3% 93.3% 53.3% 10.0% -104 dBm |
| Thousand Island Park, NY | 100.0% 100.0% 62.5% 25.0% -98 dBm | 100.0% 100.0% 87.5% 87.5% -109 dBm | 100.0% 100.0% 75.0% 50.0% -95 dBm |
| Three Mile Bay, NY | 100.0% 100.0% 0.0% 0.0% -98 dBm | 100.0% 100.0% 33.3% 0.0% -115 dBm | N/A N/A N/A N/A N/A |
| Watertown, NY | 100.0% 100.0% 92.2% 80.0% -84 dBm | 100.0% 100.0% 100.0% 68.3% -98 dBm | 100.0% 100.0% 99.5% 94.1% -84 dBm |
| Wellesley Island, NY | 100.0% 100.0% 52.0% 30.2% -99 dBm | 97.9% 97.9% 65.8% 58.4% -115 dBm | 60.5% 60.5% 49.1% 19.9% -98 dBm |
| West Carthage, NY | 100.0% 100.0% 0.0% 0.0% -88 dBm | 100.0% 100.0% 100.0% 93.3% -98 dBm | 100.0% 100.0% 96.7% 76.7% -92 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 Jefferson County, NY 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.