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

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

Coverage rankings for Mason County, IL

AT&T currently ranks first for coverage in this area, with a coverage score of 84.4. Carrierlytics uses FCC broadband map data to estimate and calculate coverage scores. More on that further below.

Rank Carrier Score Overall 4G LTE 5G Fast 5G Average Signal
1 AT&T 84.4 98.5% 98.5% 80.8% 67.8% -112 dBm
2 Verizon 72.2 95.4% 95.3% 42.9% 29.3% -94 dBm
3 T-Mobile 71.1 77.8% 77.8% 63.5% 40.9% -95 dBm

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

Cell phone coverage map for Mason 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 Carrierlytics.

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Cell phone coverage by network in Mason County, IL

#1

AT&T

Coverage Score 84.4
In Mason County, IL
Overall
98.5%
4G LTE
98.5%
5G
80.8%
Fast 5G
67.8%
Average Signal -112 dBm
#2

Verizon

Coverage Score 72.2
In Mason County, IL
Overall
95.4%
4G LTE
95.3%
5G
42.9%
Fast 5G
29.3%
Average Signal -94 dBm
#3

T-Mobile

Coverage Score 71.1
In Mason County, IL
Overall
77.8%
4G LTE
77.8%
5G
63.5%
Fast 5G
40.9%
Average Signal -95 dBm
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Coverage by city in Mason County, IL

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

City Verizon AT&T T-Mobile
Bath, IL 100.0% 100.0% 0.0% 0.0% -106 dBm 87.5% 87.5% 0.0% 0.0% -119 dBm N/A N/A N/A N/A N/A
Easton, IL 100.0% 100.0% 0.0% 0.0% -100 dBm 100.0% 100.0% 100.0% 100.0% -113 dBm 100.0% 100.0% 75.0% 25.0% -98 dBm
Forest City, IL 100.0% 100.0% 0.0% 0.0% -83 dBm 100.0% 100.0% 66.7% 66.7% -117 dBm 100.0% 100.0% 100.0% 91.7% -83 dBm
Goofy Ridge, IL 100.0% 100.0% 3.1% 0.0% -100 dBm 100.0% 100.0% 15.6% 9.4% -113 dBm 62.5% 62.5% 56.3% 21.9% -98 dBm
Havana, IL 100.0% 100.0% 100.0% 95.8% -76 dBm 100.0% 100.0% 100.0% 93.0% -94 dBm 100.0% 100.0% 100.0% 88.7% -85 dBm
Kilbourne, IL 100.0% 100.0% 0.0% 0.0% -60 dBm 100.0% 100.0% 100.0% 90.5% -87 dBm 61.9% 61.9% 9.5% 4.8% -107 dBm
Manito, IL 100.0% 100.0% 94.6% 83.8% -81 dBm 100.0% 100.0% 100.0% 97.3% -90 dBm 54.1% 54.1% 32.4% 10.8% -103 dBm
Mason City Census Place 1747475, IL 100.0% 100.0% 100.0% 100.0% -73 dBm 100.0% 100.0% 100.0% 100.0% -90 dBm 100.0% 100.0% 100.0% 100.0% -77 dBm
San Jose, IL 100.0% 100.0% 76.9% 53.8% -95 dBm 100.0% 100.0% 61.5% 15.4% -118 dBm 84.6% 84.6% 53.8% 30.8% -98 dBm
Topeka, IL 100.0% 100.0% 25.0% 25.0% -105 dBm 100.0% 100.0% 100.0% 75.0% -120 dBm 100.0% 100.0% 100.0% 0.0% -100 dBm

About The Coverage Data

Coverage and signal estimates are derived by Carrierlytics 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 Mason 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.