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

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

Coverage rankings for Marion County, IL

Verizon currently ranks first for coverage in this area, with a coverage score of 80.9. Compare Wireless Carriers uses FCC broadband map data to estimate and calculate coverage scores. More on that further below.

RankCarrierScoreOverall4G LTE5GFast 5GAverage Signal
1Verizon80.994.0%93.9%61.0%50.2% -94 dBm
2AT&T79.696.1%96.1%69.8%55.9% -112 dBm
3T-Mobile73.477.5%77.5%65.9%47.1% -94 dBm

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

Cell phone coverage map for Marion 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 Marion County, IL

#1

Verizon

Coverage Score 80.9
In Marion County, IL
Overall
94.0%
4G LTE
93.9%
5G
61.0%
Fast 5G
50.2%
Average Signal -94 dBm
#2

AT&T

Coverage Score 79.6
In Marion County, IL
Overall
96.1%
4G LTE
96.1%
5G
69.8%
Fast 5G
55.9%
Average Signal -112 dBm
#3

T-Mobile

Coverage Score 73.4
In Marion County, IL
Overall
77.5%
4G LTE
77.5%
5G
65.9%
Fast 5G
47.1%
Average Signal -94 dBm
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Coverage by city in Marion County, IL

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

CityVerizonAT&TT-Mobile
Alma, IL 100.0% 100.0% 100.0% 100.0% -83 dBm 100.0% 100.0% 93.3% 93.3% -113 dBm 100.0% 100.0% 100.0% 80.0% -91 dBm
Central City, IL 100.0% 100.0% 100.0% 92.3% -75 dBm 100.0% 100.0% 100.0% 92.3% -108 dBm 100.0% 100.0% 100.0% 100.0% -83 dBm
Centralia, IL 100.0% 100.0% 86.4% 72.2% -85 dBm 100.0% 100.0% 94.9% 67.2% -103 dBm 99.0% 99.0% 97.0% 87.9% -83 dBm
Iuka, IL 100.0% 100.0% 100.0% 93.8% -88 dBm 100.0% 100.0% 43.8% 43.8% -104 dBm 100.0% 100.0% 100.0% 62.5% -94 dBm
Junction City, IL 100.0% 100.0% 62.5% 56.3% -99 dBm 100.0% 100.0% 93.8% 93.8% -114 dBm 100.0% 100.0% 100.0% 75.0% -94 dBm
Kell, IL 100.0% 100.0% 32.0% 16.0% -99 dBm 100.0% 100.0% 88.0% 56.0% -117 dBm 28.0% 28.0% 12.0% 0.0% -106 dBm
Kinmundy, IL 100.0% 100.0% 100.0% 96.7% -77 dBm 100.0% 100.0% 100.0% 86.7% -105 dBm 100.0% 100.0% 100.0% 100.0% -80 dBm
Odin, IL 100.0% 100.0% 80.8% 61.5% -94 dBm 100.0% 100.0% 100.0% 100.0% -107 dBm 100.0% 100.0% 100.0% 53.8% -95 dBm
Patoka, IL 100.0% 100.0% 82.8% 55.2% -90 dBm 100.0% 100.0% 100.0% 100.0% -89 dBm 100.0% 100.0% 100.0% 100.0% -72 dBm
Salem, IL 100.0% 100.0% 86.7% 72.2% -86 dBm 100.0% 100.0% 98.9% 94.4% -99 dBm 100.0% 100.0% 99.4% 91.1% -84 dBm
Sandoval, IL 100.0% 100.0% 91.7% 58.3% -92 dBm 100.0% 100.0% 100.0% 95.8% -91 dBm 100.0% 100.0% 100.0% 100.0% -75 dBm
Vernon, IL 100.0% 100.0% 100.0% 95.7% -80 dBm 100.0% 100.0% 87.0% 60.9% -114 dBm 100.0% 100.0% 100.0% 87.0% -90 dBm
Walnut Hill, IL 100.0% 100.0% 66.7% 33.3% -98 dBm 100.0% 100.0% 100.0% 77.8% -120 dBm 88.9% 88.9% 44.4% 0.0% -105 dBm
Farina, IL 100.0% 100.0% 100.0% 100.0% -69 dBm 100.0% 100.0% 100.0% 100.0% -104 dBm 100.0% 100.0% 100.0% 100.0% -86 dBm
Wamac, IL 100.0% 100.0% 94.4% 94.4% -78 dBm 100.0% 100.0% 97.2% 80.6% -99 dBm 97.2% 97.2% 91.7% 77.8% -93 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 Marion 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.