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

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

Coverage rankings for Jersey County, IL

AT&T currently ranks first for coverage in this area, with a coverage score of 71.6. Compare Wireless Carriers uses FCC broadband map data to estimate and calculate coverage scores. More on that further below.

RankCarrierScoreOverall4G LTE5GFast 5GAverage Signal
1AT&T71.691.8%91.7%55.5%43.4% -114 dBm
2T-Mobile60.161.5%61.5%50.9%34.9% -94 dBm
3Verizon57.596.1%96.1%12.2%3.2% -98 dBm

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

Cell phone coverage map for Jersey 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 Jersey County, IL

#1

AT&T

Coverage Score 71.6
In Jersey County, IL
Overall
91.8%
4G LTE
91.7%
5G
55.5%
Fast 5G
43.4%
Average Signal -114 dBm
#2

T-Mobile

Coverage Score 60.1
In Jersey County, IL
Overall
61.5%
4G LTE
61.5%
5G
50.9%
Fast 5G
34.9%
Average Signal -94 dBm
#3

Verizon

Coverage Score 57.5
In Jersey County, IL
Overall
96.1%
4G LTE
96.1%
5G
12.2%
Fast 5G
3.2%
Average Signal -98 dBm
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Coverage by city in Jersey County, IL

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

CityVerizonAT&TT-Mobile
Elsah, IL 81.5% 81.5% 3.7% 0.0% -98 dBm 92.6% 92.6% 25.9% 25.9% -112 dBm 14.8% 14.8% 11.1% 3.7% -100 dBm
Fidelity, IL 100.0% 100.0% 66.7% 0.0% -103 dBm 100.0% 100.0% 66.7% 66.7% -110 dBm 100.0% 100.0% 100.0% 66.7% -100 dBm
Fieldon, IL 100.0% 100.0% 0.0% 0.0% -64 dBm 100.0% 100.0% 100.0% 100.0% -98 dBm N/A N/A N/A N/A N/A
Grafton, IL 92.0% 92.0% 22.0% 1.0% -97 dBm 92.0% 92.0% 80.0% 61.0% -108 dBm 75.0% 75.0% 64.0% 44.0% -89 dBm
Jerseyville, IL 100.0% 100.0% 0.0% 0.0% -76 dBm 100.0% 100.0% 94.7% 80.9% -107 dBm 100.0% 100.0% 100.0% 100.0% -74 dBm
Otterville, IL 100.0% 100.0% 0.0% 0.0% -93 dBm 96.0% 96.0% 96.0% 88.0% -115 dBm 96.0% 96.0% 84.0% 32.0% -100 dBm
Brighton, IL 100.0% 100.0% 98.0% 95.9% -70 dBm 100.0% 100.0% 75.5% 69.4% -110 dBm 51.0% 51.0% 16.3% 0.0% -106 dBm
Godfrey, IL 96.5% 96.5% 22.4% 8.3% -97 dBm 99.8% 99.7% 86.0% 71.0% -110 dBm 99.5% 99.5% 96.0% 77.3% -89 dBm
Medora, IL 100.0% 100.0% 18.2% 0.0% -101 dBm 100.0% 100.0% 0.0% 0.0% -75 dBm N/A N/A N/A N/A N/A

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 Jersey 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.