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

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

Coverage rankings for Stephenson County, IL

T-Mobile currently ranks first for coverage in this area, with a coverage score of 70.8. Compare Wireless Carriers uses FCC broadband map data to estimate and calculate coverage scores. More on that further below.

RankCarrierScoreOverall4G LTE5GFast 5GAverage Signal
1T-Mobile70.876.8%76.8%61.8%41.7% -94 dBm
2Verizon66.899.7%99.7%30.1%15.2% -96 dBm
3AT&T54.686.2%85.5%20.7%16.0% -113 dBm

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

Cell phone coverage map for Stephenson 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 Stephenson County, IL

#1

T-Mobile

Coverage Score 70.8
In Stephenson County, IL
Overall
76.8%
4G LTE
76.8%
5G
61.8%
Fast 5G
41.7%
Average Signal -94 dBm
#2

Verizon

Coverage Score 66.8
In Stephenson County, IL
Overall
99.7%
4G LTE
99.7%
5G
30.1%
Fast 5G
15.2%
Average Signal -96 dBm
#3

AT&T

Coverage Score 54.6
In Stephenson County, IL
Overall
86.2%
4G LTE
85.5%
5G
20.7%
Fast 5G
16.0%
Average Signal -113 dBm
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Coverage by city in Stephenson County, IL

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

CityVerizonAT&TT-Mobile
Cedarville, IL 100.0% 100.0% 50.0% 8.3% -95 dBm 91.7% 91.7% 0.0% 0.0% -117 dBm 8.3% 8.3% 0.0% 0.0% -100 dBm
Dakota, IL 100.0% 100.0% 0.0% 0.0% -89 dBm 85.7% 85.7% 0.0% 0.0% -115 dBm 100.0% 100.0% 85.7% 28.6% -99 dBm
Davis, IL 100.0% 100.0% 0.0% 0.0% -76 dBm 100.0% 100.0% 0.0% 0.0% -120 dBm 44.4% 44.4% 11.1% 0.0% -108 dBm
Freeport, IL 100.0% 100.0% 24.7% 11.5% -85 dBm 99.7% 99.7% 41.3% 31.6% -107 dBm 100.0% 100.0% 100.0% 99.0% -83 dBm
German Valley, IL 100.0% 100.0% 9.1% 0.0% -100 dBm 81.8% 81.8% 9.1% 0.0% -120 dBm 27.3% 27.3% 18.2% 9.1% -100 dBm
Lena, IL 100.0% 100.0% 73.1% 49.3% -94 dBm 100.0% 100.0% 22.4% 22.4% -111 dBm 89.6% 89.6% 74.6% 40.3% -93 dBm
Orangeville, IL 100.0% 100.0% 0.0% 0.0% -101 dBm 100.0% 100.0% 0.0% 0.0% -85 dBm 100.0% 100.0% 100.0% 100.0% -66 dBm
Pearl City Census Place 1758369, IL 100.0% 100.0% 0.0% 0.0% -104 dBm 100.0% 100.0% 26.3% 26.3% -114 dBm 84.2% 84.2% 57.9% 21.1% -100 dBm
Ridott, IL 100.0% 100.0% 100.0% 0.0% -100 dBm 100.0% 100.0% 0.0% 0.0% -120 dBm 100.0% 100.0% 100.0% 100.0% -90 dBm
Rock City, IL 100.0% 100.0% 0.0% 0.0% -93 dBm 100.0% 100.0% 0.0% 0.0% -117 dBm N/A N/A N/A N/A N/A
Willow Lake, IL 100.0% 100.0% 73.1% 61.2% -85 dBm 100.0% 100.0% 29.9% 28.4% -110 dBm 100.0% 100.0% 88.1% 37.3% -96 dBm
Winslow, IL 100.0% 100.0% 0.0% 0.0% -107 dBm 30.0% 30.0% 0.0% 0.0% -120 dBm 10.0% 10.0% 0.0% 0.0% -110 dBm
Baileyville, IL 100.0% 100.0% 0.0% 0.0% -100 dBm 100.0% 100.0% 0.0% 0.0% -120 dBm 33.3% 33.3% 0.0% 0.0% -110 dBm
Lake Carroll, IL 100.0% 100.0% 36.1% 21.8% -94 dBm 100.0% 100.0% 2.1% 2.1% -104 dBm 1.8% 1.8% 0.0% 0.0% -110 dBm
Lake Summerset, IL 100.0% 100.0% 0.0% 0.0% -91 dBm 100.0% 100.0% 0.0% 0.0% -98 dBm 21.2% 21.2% 13.5% 0.0% -103 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 Stephenson 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.