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

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

Coverage rankings for Alexander County, IL

AT&T currently ranks first for coverage in this area, with a coverage score of 73.9. Compare Wireless Carriers uses FCC broadband map data to estimate and calculate coverage scores. More on that further below.

RankCarrierScoreOverall4G LTE5GFast 5GAverage Signal
1AT&T73.989.4%89.2%69.7%47.0% -114 dBm
2Verizon52.988.2%88.2%5.8%2.6% -97 dBm
3T-Mobile36.531.3%31.3%24.1%17.5% -93 dBm

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

Cell phone coverage map for Alexander 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 Alexander County, IL

#1

AT&T

Coverage Score 73.9
In Alexander County, IL
Overall
89.4%
4G LTE
89.2%
5G
69.7%
Fast 5G
47.0%
Average Signal -114 dBm
#2

Verizon

Coverage Score 52.9
In Alexander County, IL
Overall
88.2%
4G LTE
88.2%
5G
5.8%
Fast 5G
2.6%
Average Signal -97 dBm
#3

T-Mobile

Coverage Score 36.5
In Alexander County, IL
Overall
31.3%
4G LTE
31.3%
5G
24.1%
Fast 5G
17.5%
Average Signal -93 dBm
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Coverage by city in Alexander County, IL

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

CityVerizonAT&TT-Mobile
Cairo, IL 100.0% 100.0% 65.0% 41.8% -92 dBm 100.0% 100.0% 100.0% 80.2% -103 dBm 100.0% 100.0% 99.4% 86.4% -82 dBm
East Cape Girardeau, IL 100.0% 100.0% 33.3% 0.0% -87 dBm 100.0% 100.0% 97.9% 10.4% -109 dBm 100.0% 100.0% 100.0% 100.0% -81 dBm
McClure, IL 100.0% 100.0% 0.0% 0.0% -81 dBm 100.0% 100.0% 100.0% 97.2% -97 dBm 100.0% 100.0% 100.0% 97.2% -73 dBm
Olive Branch, IL 99.1% 99.1% 0.0% 0.0% -88 dBm 98.7% 98.7% 92.6% 73.2% -107 dBm 17.7% 17.7% 8.2% 0.0% -104 dBm
Tamms, IL 100.0% 100.0% 0.0% 0.0% -75 dBm 100.0% 100.0% 100.0% 98.3% -97 dBm 13.6% 13.6% 3.4% 0.0% -108 dBm
Thebes, IL 97.7% 97.7% 0.0% 0.0% -98 dBm 100.0% 97.7% 95.3% 74.4% -112 dBm 4.7% 4.7% 2.3% 0.0% -105 dBm
Unity, IL 100.0% 100.0% 0.0% 0.0% -91 dBm 100.0% 100.0% 100.0% 88.9% -112 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 Alexander 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.