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

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

Coverage rankings for Coles County, IL

Verizon currently ranks first for coverage in this area, with a coverage score of 85.8. Compare Wireless Carriers uses FCC broadband map data to estimate and calculate coverage scores. More on that further below.

RankCarrierScoreOverall4G LTE5GFast 5GAverage Signal
1Verizon85.897.6%97.6%65.5%58.5% -90 dBm
2T-Mobile85.287.0%87.0%79.1%67.6% -88 dBm
3AT&T84.297.7%97.7%81.9%66.1% -111 dBm

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

Cell phone coverage map for Coles 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 Coles County, IL

#1

Verizon

Coverage Score 85.8
In Coles County, IL
Overall
97.6%
4G LTE
97.6%
5G
65.5%
Fast 5G
58.5%
Average Signal -90 dBm
#2

T-Mobile

Coverage Score 85.2
In Coles County, IL
Overall
87.0%
4G LTE
87.0%
5G
79.1%
Fast 5G
67.6%
Average Signal -88 dBm
#3

AT&T

Coverage Score 84.2
In Coles County, IL
Overall
97.7%
4G LTE
97.7%
5G
81.9%
Fast 5G
66.1%
Average Signal -111 dBm
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Coverage by city in Coles County, IL

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

CityVerizonAT&TT-Mobile
Ashmore, IL 100.0% 100.0% 73.7% 52.6% -96 dBm 100.0% 100.0% 100.0% 100.0% -118 dBm 100.0% 100.0% 100.0% 100.0% -69 dBm
Charleston, IL 98.2% 98.2% 88.5% 80.6% -78 dBm 100.0% 100.0% 100.0% 96.5% -95 dBm 100.0% 100.0% 97.4% 89.4% -85 dBm
Humboldt, IL 100.0% 100.0% 100.0% 100.0% -90 dBm 100.0% 100.0% 100.0% 87.5% -100 dBm 100.0% 100.0% 100.0% 100.0% -85 dBm
Janesville, IL N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
Lerna, IL 100.0% 100.0% 100.0% 50.0% -100 dBm 100.0% 100.0% 100.0% 0.0% -115 dBm 100.0% 100.0% 100.0% 100.0% -60 dBm
Mattoon, IL 100.0% 100.0% 100.0% 100.0% -70 dBm 100.0% 100.0% 100.0% 99.3% -95 dBm 100.0% 100.0% 100.0% 100.0% -79 dBm
Oakland, IL 100.0% 100.0% 0.0% 0.0% -72 dBm 100.0% 100.0% 19.0% 19.0% -92 dBm 100.0% 100.0% 100.0% 100.0% -74 dBm
Trilla, IL 100.0% 100.0% 100.0% 75.0% -93 dBm 100.0% 100.0% 100.0% 100.0% -120 dBm 100.0% 100.0% 75.0% 50.0% -98 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 Coles 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.