DeKalb County, IL Cell Phone Coverage Map & Network Rankings (2026)

Find the best cell phone network and plan to use in DeKalb County, IL

Coverage rankings for DeKalb County, IL

T-Mobile currently ranks first for coverage in this area, with a coverage score of 97.7. Compare Wireless Carriers uses FCC broadband map data to estimate and calculate coverage scores. More on that further below.

RankCarrierScoreOverall4G LTE5GFast 5GAverage Signal
1T-Mobile97.799.5%99.5%98.5%93.2% -84 dBm
2Verizon84.3100.0%100.0%70.2%45.6% -91 dBm
3AT&T83.199.5%99.5%85.3%57.7% -113 dBm

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

Cell phone coverage map for DeKalb County, IL

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 DeKalb County, IL

#1

T-Mobile

Coverage Score 97.7
In DeKalb County, IL
Overall
99.5%
4G LTE
99.5%
5G
98.5%
Fast 5G
93.2%
Average Signal -84 dBm
#2

Verizon

Coverage Score 84.3
In DeKalb County, IL
Overall
100.0%
4G LTE
100.0%
5G
70.2%
Fast 5G
45.6%
Average Signal -91 dBm
#3

AT&T

Coverage Score 83.1
In DeKalb County, IL
Overall
99.5%
4G LTE
99.5%
5G
85.3%
Fast 5G
57.7%
Average Signal -113 dBm
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Coverage by city in DeKalb County, IL

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

CityVerizonAT&TT-Mobile
Cortland, IL 100.0% 100.0% 100.0% 88.8% -88 dBm 100.0% 100.0% 98.9% 89.9% -114 dBm 100.0% 100.0% 100.0% 100.0% -77 dBm
Dekalb, IL 100.0% 100.0% 96.6% 90.7% -83 dBm 100.0% 100.0% 100.0% 85.4% -106 dBm 100.0% 100.0% 100.0% 99.5% -79 dBm
Genoa, IL 100.0% 100.0% 6.0% 0.0% -81 dBm 100.0% 100.0% 92.5% 92.5% -105 dBm 100.0% 100.0% 95.5% 71.6% -90 dBm
Hinckley, IL 100.0% 100.0% 63.2% 31.6% -95 dBm 100.0% 100.0% 21.1% 21.1% -97 dBm 100.0% 100.0% 100.0% 84.2% -91 dBm
Kingston Census Place 1740065, IL 100.0% 100.0% 0.0% 0.0% -73 dBm 92.0% 92.0% 44.0% 40.0% -119 dBm 100.0% 100.0% 100.0% 96.0% -81 dBm
Kirkland, IL 100.0% 100.0% 0.0% 0.0% -85 dBm 100.0% 100.0% 77.4% 48.4% -114 dBm 100.0% 100.0% 93.5% 48.4% -95 dBm
Malta, IL 100.0% 100.0% 40.0% 0.0% -93 dBm 100.0% 100.0% 53.3% 0.0% -110 dBm 100.0% 100.0% 100.0% 100.0% -75 dBm
Maple Park, IL 100.0% 100.0% 100.0% 100.0% -83 dBm 100.0% 100.0% 100.0% 98.3% -103 dBm 100.0% 100.0% 100.0% 100.0% -77 dBm
Sandwich, IL 100.0% 100.0% 98.3% 94.1% -79 dBm 100.0% 100.0% 96.6% 63.9% -103 dBm 100.0% 100.0% 100.0% 95.8% -78 dBm
Shabbona, IL 100.0% 100.0% 96.7% 76.7% -92 dBm 100.0% 100.0% 36.7% 0.0% -120 dBm 100.0% 100.0% 100.0% 100.0% -81 dBm
Somonauk, IL 100.0% 100.0% 93.4% 68.9% -92 dBm 100.0% 100.0% 100.0% 70.5% -99 dBm 100.0% 100.0% 100.0% 96.7% -75 dBm
Sycamore, IL 100.0% 100.0% 97.9% 87.6% -85 dBm 100.0% 100.0% 98.8% 90.9% -108 dBm 100.0% 100.0% 100.0% 99.6% -80 dBm
Waterman, IL 100.0% 100.0% 100.0% 90.2% -89 dBm 100.0% 100.0% 95.1% 85.4% -113 dBm 100.0% 100.0% 100.0% 97.6% -87 dBm
Lake Holiday, IL 100.0% 100.0% 96.7% 78.0% -84 dBm 100.0% 100.0% 100.0% 90.1% -101 dBm 100.0% 100.0% 100.0% 96.7% -83 dBm
Lee, IL 100.0% 100.0% 100.0% 60.0% -94 dBm 100.0% 100.0% 40.0% 0.0% -118 dBm 100.0% 100.0% 100.0% 80.0% -94 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 DeKalb County, IL 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.