Barnwell County, SC Cell Phone Coverage Map & Network Rankings (2026)

Find the best cell phone network and plan to use in Barnwell County, SC

Coverage rankings for Barnwell County, SC

AT&T currently ranks first for coverage in this area, with a coverage score of 65.8. Compare Wireless Carriers uses FCC broadband map data to estimate and calculate coverage scores. More on that further below.

RankCarrierScoreOverall4G LTE5GFast 5GAverage Signal
1AT&T65.887.1%87.1%45.0%36.7% -114 dBm
2Verizon59.598.3%98.3%14.7%6.1% -100 dBm
3T-Mobile55.757.4%57.1%49.3%28.3% -95 dBm

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

Cell phone coverage map for Barnwell County, SC

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 Barnwell County, SC

#1

AT&T

Coverage Score 65.8
In Barnwell County, SC
Overall
87.1%
4G LTE
87.1%
5G
45.0%
Fast 5G
36.7%
Average Signal -114 dBm
#2

Verizon

Coverage Score 59.5
In Barnwell County, SC
Overall
98.3%
4G LTE
98.3%
5G
14.7%
Fast 5G
6.1%
Average Signal -100 dBm
#3

T-Mobile

Coverage Score 55.7
In Barnwell County, SC
Overall
57.4%
4G LTE
57.1%
5G
49.3%
Fast 5G
28.3%
Average Signal -95 dBm
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Coverage by city in Barnwell County, SC

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

CityVerizonAT&TT-Mobile
Barnwell, SC 100.0% 100.0% 59.2% 47.4% -88 dBm 100.0% 100.0% 98.6% 85.4% -108 dBm 100.0% 100.0% 100.0% 86.9% -86 dBm
Blackville, SC 100.0% 100.0% 74.7% 55.4% -88 dBm 100.0% 100.0% 100.0% 94.0% -102 dBm 99.6% 99.6% 98.8% 95.2% -82 dBm
Elko, SC 100.0% 100.0% 0.0% 0.0% -95 dBm 100.0% 100.0% 13.8% 13.8% -95 dBm 100.0% 100.0% 100.0% 89.7% -89 dBm
Hilda, SC 100.0% 100.0% 72.1% 53.5% -86 dBm 100.0% 100.0% 100.0% 100.0% -108 dBm 7.0% 5.8% 3.5% 0.0% -105 dBm
Kline, SC 100.0% 100.0% 0.0% 0.0% -95 dBm 100.0% 100.0% 80.2% 61.6% -117 dBm 100.0% 100.0% 93.0% 54.7% -97 dBm
Snelling, SC 100.0% 100.0% 9.8% 0.0% -98 dBm 74.1% 74.1% 8.0% 0.9% -119 dBm 92.0% 92.0% 87.5% 36.6% -97 dBm
Williston, SC 100.0% 100.0% 0.4% 0.0% -88 dBm 100.0% 100.0% 1.7% 1.7% -99 dBm 99.6% 99.6% 97.5% 85.8% -87 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 Barnwell County, SC 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.