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

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

Coverage rankings for Sullivan County, MO

Verizon currently ranks first for coverage in this area, with a coverage score of 48.0. Compare Wireless Carriers uses FCC broadband map data to estimate and calculate coverage scores. More on that further below.

RankCarrierScoreOverall4G LTE5GFast 5GAverage Signal
1Verizon48.083.8%83.8%0.4%0.0% -101 dBm
2AT&T41.972.8%72.8%6.6%5.5% -116 dBm
3T-Mobile25.218.0%16.7%16.5%7.6% -95 dBm

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

Cell phone coverage map for Sullivan County, MO

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, MO

#1

Verizon

Coverage Score 48.0
In Sullivan County, MO
Overall
83.8%
4G LTE
83.8%
5G
0.4%
Fast 5G
0.0%
Average Signal -101 dBm
#2

AT&T

Coverage Score 41.9
In Sullivan County, MO
Overall
72.8%
4G LTE
72.8%
5G
6.6%
Fast 5G
5.5%
Average Signal -116 dBm
#3

T-Mobile

Coverage Score 25.2
In Sullivan County, MO
Overall
18.0%
4G LTE
16.7%
5G
16.5%
Fast 5G
7.6%
Average Signal -95 dBm
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Coverage by city in Sullivan County, MO

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

CityVerizonAT&TT-Mobile
Green Castle, MO 100.0% 100.0% 0.0% 0.0% -65 dBm 100.0% 100.0% 0.0% 0.0% -113 dBm 36.4% 36.4% 36.4% 0.0% -100 dBm
Green City, MO 100.0% 100.0% 0.0% 0.0% -95 dBm 100.0% 100.0% 0.0% 0.0% -97 dBm 45.7% 42.9% 42.9% 14.3% -98 dBm
Harris, MO 100.0% 100.0% 0.0% 0.0% -108 dBm 75.0% 75.0% 0.0% 0.0% -120 dBm N/A N/A N/A N/A N/A
Humphreys, MO 100.0% 100.0% 0.0% 0.0% -78 dBm 50.0% 50.0% 0.0% 0.0% -120 dBm 16.7% 16.7% 0.0% 0.0% -100 dBm
Milan, MO 100.0% 100.0% 0.0% 0.0% -87 dBm 100.0% 100.0% 100.0% 79.1% -109 dBm 100.0% 100.0% 100.0% 100.0% -83 dBm
Newtown, MO 83.3% 83.3% 0.0% 0.0% -108 dBm 33.3% 33.3% 0.0% 0.0% -120 dBm N/A N/A N/A N/A N/A
Osgood, MO 100.0% 100.0% 0.0% 0.0% -100 dBm N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
Pollock, MO 75.0% 75.0% 0.0% 0.0% -107 dBm 50.0% 50.0% 0.0% 0.0% -115 dBm 25.0% 25.0% 25.0% 0.0% -100 dBm
Winigan, MO 100.0% 100.0% 33.3% 0.0% -102 dBm 91.7% 91.7% 0.0% 0.0% -116 dBm N/A N/A N/A N/A N/A
Browning, MO 81.8% 81.8% 0.0% 0.0% -107 dBm 90.9% 90.9% 0.0% 0.0% -114 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 Sullivan County, MO 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.