Frederick County, MD Cell Phone Coverage Map & Network Rankings (2026)

Find the best cell phone network and plan to use in Frederick County, MD

Coverage rankings for Frederick County, MD

T-Mobile currently ranks first for coverage in this area, with a coverage score of 90.2. Compare Wireless Carriers uses FCC broadband map data to estimate and calculate coverage scores. More on that further below.

RankCarrierScoreOverall4G LTE5GFast 5GAverage Signal
1T-Mobile90.293.0%93.0%87.9%73.4% -87 dBm
2AT&T82.495.6%95.4%85.8%58.6% -110 dBm
3Verizon65.596.3%96.3%26.3%16.1% -94 dBm

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

Cell phone coverage map for Frederick County, MD

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.

Loading coverage map...

Cell phone coverage by network in Frederick County, MD

#1

T-Mobile

Coverage Score 90.2
In Frederick County, MD
Overall
93.0%
4G LTE
93.0%
5G
87.9%
Fast 5G
73.4%
Average Signal -87 dBm
#2

AT&T

Coverage Score 82.4
In Frederick County, MD
Overall
95.6%
4G LTE
95.4%
5G
85.8%
Fast 5G
58.6%
Average Signal -110 dBm
#3

Verizon

Coverage Score 65.5
In Frederick County, MD
Overall
96.3%
4G LTE
96.3%
5G
26.3%
Fast 5G
16.1%
Average Signal -94 dBm
Sponsored US Mobile

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.

Choose your network
Dark Star Light Speed Warp 5G
Unlimited plans from
$22.50/mo
Phone + home internet bundle from
$47/mo
Shop US Mobile

Pricing, network access, switching terms, and home internet availability may vary.

Coverage by city in Frederick County, MD

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

CityVerizonAT&TT-Mobile
Adamstown, MD 100.0% 100.0% 37.0% 0.0% -94 dBm 100.0% 100.0% 100.0% 92.6% -110 dBm 100.0% 100.0% 100.0% 100.0% -79 dBm
Ballenger Creek, MD 100.0% 100.0% 81.3% 65.8% -86 dBm 99.6% 99.6% 99.3% 91.2% -96 dBm 99.6% 99.6% 99.6% 98.5% -75 dBm
Bartonsville, MD 100.0% 100.0% 85.2% 63.0% -88 dBm 100.0% 100.0% 100.0% 85.2% -106 dBm 100.0% 100.0% 100.0% 100.0% -79 dBm
Braddock Heights, MD 100.0% 100.0% 43.6% 17.3% -97 dBm 100.0% 100.0% 97.0% 80.5% -107 dBm 100.0% 100.0% 97.7% 85.7% -87 dBm
Brunswick, MD 100.0% 100.0% 0.0% 0.0% -86 dBm 100.0% 100.0% 100.0% 84.3% -99 dBm 100.0% 100.0% 100.0% 97.6% -79 dBm
Buckeystown, MD 100.0% 100.0% 0.0% 0.0% -94 dBm 100.0% 100.0% 100.0% 86.4% -113 dBm 100.0% 100.0% 100.0% 81.8% -91 dBm
Burkittsville, MD 100.0% 100.0% 0.0% 0.0% -93 dBm 100.0% 100.0% 91.7% 0.0% -116 dBm 100.0% 100.0% 91.7% 83.3% -93 dBm
Emmitsburg, MD 100.0% 100.0% 2.4% 2.4% -92 dBm 100.0% 100.0% 100.0% 97.6% -106 dBm 100.0% 100.0% 100.0% 100.0% -85 dBm
Frederick, MD 100.0% 100.0% 78.7% 58.4% -88 dBm 100.0% 100.0% 99.7% 73.6% -101 dBm 100.0% 100.0% 100.0% 99.5% -77 dBm
Graceham, MD 100.0% 100.0% 0.0% 0.0% -86 dBm 100.0% 100.0% 100.0% 100.0% -102 dBm 100.0% 100.0% 100.0% 100.0% -86 dBm
Green Valley, MD 99.5% 99.5% 23.6% 11.4% -98 dBm 99.1% 97.2% 93.2% 52.1% -110 dBm 99.8% 99.8% 98.6% 91.6% -86 dBm
Ijamsville, MD 99.3% 99.3% 6.9% 1.4% -91 dBm 99.0% 96.6% 94.8% 58.3% -109 dBm 100.0% 100.0% 100.0% 95.5% -81 dBm
Jefferson, MD 100.0% 100.0% 66.7% 53.6% -87 dBm 100.0% 100.0% 100.0% 95.7% -105 dBm 100.0% 100.0% 100.0% 100.0% -81 dBm
Keymar, MD 99.8% 99.8% 20.4% 16.1% -91 dBm 98.0% 94.4% 86.5% 51.8% -112 dBm 92.3% 92.2% 87.6% 70.7% -88 dBm
Knoxville, MD 99.7% 99.7% 6.4% 1.9% -95 dBm 98.2% 94.6% 92.3% 66.5% -108 dBm 89.4% 89.4% 77.3% 54.1% -91 dBm
Lewistown, MD 100.0% 100.0% 100.0% 100.0% -80 dBm 100.0% 100.0% 100.0% 100.0% -92 dBm 100.0% 100.0% 100.0% 100.0% -68 dBm
Libertytown, MD 100.0% 100.0% 0.0% 0.0% -84 dBm 100.0% 100.0% 100.0% 41.9% -100 dBm 100.0% 100.0% 100.0% 96.8% -77 dBm
Linganore, MD 99.5% 99.5% 31.9% 19.1% -96 dBm 96.6% 96.6% 87.3% 68.1% -112 dBm 98.5% 98.5% 95.1% 84.3% -87 dBm
Middletown, MD 100.0% 100.0% 56.9% 17.2% -91 dBm 100.0% 100.0% 100.0% 91.4% -99 dBm 100.0% 100.0% 100.0% 100.0% -76 dBm
Monrovia, MD 100.0% 100.0% 5.2% 0.0% -82 dBm 100.0% 100.0% 100.0% 96.6% -102 dBm 100.0% 100.0% 100.0% 100.0% -74 dBm
Myersville, MD 100.0% 100.0% 0.0% 0.0% -88 dBm 100.0% 100.0% 100.0% 85.3% -109 dBm 100.0% 100.0% 100.0% 100.0% -83 dBm
New Market, MD 100.0% 100.0% 0.0% 0.0% -85 dBm 100.0% 100.0% 97.9% 83.0% -108 dBm 100.0% 100.0% 100.0% 100.0% -77 dBm
Point Of Rocks, MD 100.0% 100.0% 0.0% 0.0% -87 dBm 100.0% 100.0% 100.0% 100.0% -100 dBm 100.0% 100.0% 100.0% 96.3% -81 dBm
Rocky Ridge, MD 98.2% 98.2% 0.7% 0.0% -90 dBm 98.7% 98.7% 85.6% 57.2% -114 dBm 93.8% 93.8% 82.7% 62.3% -91 dBm
Rosemont, MD 100.0% 100.0% 0.0% 0.0% -81 dBm 100.0% 100.0% 100.0% 100.0% -96 dBm 100.0% 100.0% 100.0% 100.0% -78 dBm
Sabillasville, MD 100.0% 100.0% 64.3% 40.5% -95 dBm 100.0% 100.0% 97.6% 59.5% -107 dBm 100.0% 100.0% 100.0% 88.1% -86 dBm
Spring Ridge, MD 100.0% 100.0% 66.7% 39.4% -92 dBm 100.0% 100.0% 95.5% 71.2% -109 dBm 100.0% 100.0% 100.0% 98.5% -77 dBm
Thurmont, MD 100.0% 100.0% 0.0% 0.0% -87 dBm 100.0% 100.0% 100.0% 95.0% -101 dBm 100.0% 100.0% 100.0% 98.8% -76 dBm
Tuscarora, MD 96.9% 96.7% 13.4% 5.3% -94 dBm 98.2% 97.9% 85.8% 61.9% -111 dBm 88.4% 88.4% 71.1% 47.4% -91 dBm
Urbana, MD 100.0% 100.0% 45.9% 30.6% -92 dBm 100.0% 100.0% 98.0% 83.7% -104 dBm 100.0% 100.0% 99.5% 94.9% -82 dBm
Walkersville, MD 100.0% 100.0% 85.0% 64.2% -88 dBm 100.0% 100.0% 100.0% 72.5% -101 dBm 100.0% 100.0% 100.0% 100.0% -80 dBm
Woodsboro, MD 100.0% 100.0% 88.9% 83.3% -78 dBm 100.0% 100.0% 100.0% 83.3% -94 dBm 100.0% 100.0% 100.0% 100.0% -71 dBm
Highfield-Cascade, MD 100.0% 100.0% 7.1% 0.0% -98 dBm 100.0% 100.0% 78.6% 76.2% -111 dBm 90.5% 90.5% 85.7% 78.6% -85 dBm
Mount Airy, MD 100.0% 100.0% 100.0% 88.5% -87 dBm 100.0% 99.0% 100.0% 87.5% -102 dBm 100.0% 100.0% 100.0% 99.0% -78 dBm
Union Bridge, MD 100.0% 100.0% 0.0% 0.0% -74 dBm 100.0% 100.0% 100.0% 100.0% -97 dBm 100.0% 100.0% 100.0% 100.0% -73 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 Frederick County, MD 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.