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

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

Coverage rankings for Richland County, IL

AT&T currently ranks first for coverage in this area, with a coverage score of 83.9. 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 83.9 99.0% 99.0% 74.6% 68.5% -112 dBm
2 Verizon 81.4 99.3% 99.3% 53.3% 44.2% -89 dBm
3 T-Mobile 52.9 54.7% 54.7% 45.5% 26.2% -97 dBm

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

Cell phone coverage map for Richland 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 Richland County, IL

#1

AT&T

Coverage Score 83.9
In Richland County, IL
Overall
99.0%
4G LTE
99.0%
5G
74.6%
Fast 5G
68.5%
Average Signal -112 dBm
#2

Verizon

Coverage Score 81.4
In Richland County, IL
Overall
99.3%
4G LTE
99.3%
5G
53.3%
Fast 5G
44.2%
Average Signal -89 dBm
#3

T-Mobile

Coverage Score 52.9
In Richland County, IL
Overall
54.7%
4G LTE
54.7%
5G
45.5%
Fast 5G
26.2%
Average Signal -97 dBm
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Coverage by city in Richland County, IL

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

City Verizon AT&T T-Mobile
Calhoun, IL 100.0% 100.0% 100.0% 95.8% -84 dBm 100.0% 100.0% 100.0% 95.8% -116 dBm 75.0% 75.0% 45.8% 0.0% -103 dBm
Claremont, IL 100.0% 100.0% 0.0% 0.0% -77 dBm 100.0% 100.0% 100.0% 100.0% -88 dBm 19.0% 19.0% 4.8% 0.0% -108 dBm
Dundas, IL 100.0% 100.0% 0.0% 0.0% -77 dBm 100.0% 100.0% 100.0% 100.0% -102 dBm 55.6% 55.6% 50.0% 33.3% -99 dBm
Noble, IL 100.0% 100.0% 3.7% 0.0% -81 dBm 100.0% 100.0% 100.0% 100.0% -99 dBm 100.0% 100.0% 92.6% 55.6% -97 dBm
Olney, IL 100.0% 100.0% 91.9% 79.5% -85 dBm 100.0% 100.0% 100.0% 90.8% -96 dBm 100.0% 100.0% 100.0% 99.5% -76 dBm
Parkersburg, IL 100.0% 100.0% 95.5% 81.8% -88 dBm 100.0% 100.0% 77.3% 77.3% -119 dBm N/A N/A N/A N/A N/A
Sumner, IL 100.0% 100.0% 97.3% 97.3% -78 dBm 100.0% 100.0% 100.0% 97.3% -106 dBm N/A N/A N/A N/A N/A
West Liberty, IL 100.0% 100.0% 0.0% 0.0% -81 dBm 100.0% 100.0% 100.0% 100.0% -92 dBm 85.7% 85.7% 57.1% 21.4% -103 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 Richland 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.