Sullivan County, IN Cell Phone Coverage Map & Network Rankings (2026)

Find the best cell phone network and plan to use in Sullivan County, IN

Coverage rankings for Sullivan County, IN

AT&T currently ranks first for coverage in this area, with a coverage score of 62.1. Compare Wireless Carriers uses FCC broadband map data to estimate and calculate coverage scores. More on that further below.

RankCarrierScoreOverall4G LTE5GFast 5GAverage Signal
1AT&T62.181.4%81.2%58.0%27.1% -115 dBm
2T-Mobile59.659.1%59.1%52.4%35.6% -93 dBm
3Verizon59.589.1%88.9%22.4%13.0% -98 dBm

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

Cell phone coverage map for Sullivan County, IN

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 Sullivan County, IN

#1

AT&T

Coverage Score 62.1
In Sullivan County, IN
Overall
81.4%
4G LTE
81.2%
5G
58.0%
Fast 5G
27.1%
Average Signal -115 dBm
#2

T-Mobile

Coverage Score 59.6
In Sullivan County, IN
Overall
59.1%
4G LTE
59.1%
5G
52.4%
Fast 5G
35.6%
Average Signal -93 dBm
#3

Verizon

Coverage Score 59.5
In Sullivan County, IN
Overall
89.1%
4G LTE
88.9%
5G
22.4%
Fast 5G
13.0%
Average Signal -98 dBm
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Coverage by city in Sullivan County, IN

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

CityVerizonAT&TT-Mobile
Carlisle, IN 100.0% 100.0% 0.0% 0.0% -89 dBm 100.0% 100.0% 92.3% 30.8% -115 dBm 100.0% 100.0% 100.0% 100.0% -89 dBm
Cass, IN 100.0% 100.0% 60.0% 20.0% -100 dBm 100.0% 100.0% 100.0% 100.0% -100 dBm 100.0% 100.0% 100.0% 100.0% -74 dBm
Dugger, IN 100.0% 100.0% 80.0% 53.3% -96 dBm 100.0% 100.0% 93.3% 93.3% -103 dBm 100.0% 100.0% 100.0% 100.0% -80 dBm
Fairbanks, IN 100.0% 100.0% 0.0% 0.0% -108 dBm 100.0% 100.0% 100.0% 0.0% -112 dBm N/A N/A N/A N/A N/A
Farmersburg, IN 100.0% 100.0% 100.0% 95.2% -70 dBm 100.0% 100.0% 100.0% 57.1% -113 dBm 100.0% 100.0% 100.0% 100.0% -65 dBm
Graysville, IN 50.0% 50.0% 0.0% 0.0% -110 dBm 100.0% 100.0% 0.0% 0.0% -120 dBm 25.0% 25.0% 25.0% 0.0% -100 dBm
Hymera, IN 100.0% 100.0% 83.3% 77.8% -90 dBm 100.0% 100.0% 77.8% 22.2% -119 dBm 22.2% 22.2% 5.6% 0.0% -108 dBm
Merom, IN 100.0% 100.0% 50.0% 0.0% -110 dBm 100.0% 100.0% 50.0% 12.5% -118 dBm 12.5% 12.5% 0.0% 0.0% -100 dBm
New Lebanon, IN 100.0% 100.0% 0.0% 0.0% -100 dBm 100.0% 100.0% 100.0% 0.0% -120 dBm 75.0% 75.0% 50.0% 0.0% -103 dBm
Paxton, IN 100.0% 100.0% 0.0% 0.0% -74 dBm 100.0% 100.0% 100.0% 33.3% -115 dBm 80.0% 80.0% 60.0% 33.3% -98 dBm
Pleasantville, IN 70.0% 70.0% 0.0% 0.0% -109 dBm 30.0% 30.0% 20.0% 10.0% -120 dBm N/A N/A N/A N/A N/A
Shelburn, IN 100.0% 100.0% 100.0% 100.0% -78 dBm 100.0% 100.0% 94.4% 16.7% -116 dBm 100.0% 100.0% 100.0% 100.0% -76 dBm
Sullivan, IN 100.0% 100.0% 91.7% 79.2% -86 dBm 100.0% 100.0% 100.0% 85.4% -99 dBm 100.0% 100.0% 100.0% 100.0% -78 dBm
Coalmont, IN 100.0% 100.0% 21.6% 18.9% -98 dBm 91.9% 91.9% 64.9% 54.1% -115 dBm 21.6% 21.6% 8.1% 5.4% -104 dBm
Lewis, IN 100.0% 100.0% 50.0% 0.0% -89 dBm 87.5% 87.5% 25.0% 0.0% -120 dBm 12.5% 12.5% 0.0% 0.0% -110 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 Sullivan County, IN 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.