Lake County, CA Cell Phone Coverage Map & Network Rankings (2026)

Find the best cell phone network and plan to use in Lake County, CA

Coverage rankings for Lake County, CA

T-Mobile currently ranks first for coverage in this area, with a coverage score of 52.9. Compare Wireless Carriers uses FCC broadband map data to estimate and calculate coverage scores. More on that further below.

RankCarrierScoreOverall4G LTE5GFast 5GAverage Signal
1T-Mobile52.946.1%44.9%44.6%34.5% -89 dBm
2Verizon41.952.8%52.6%19.5%10.2% -97 dBm
3AT&T39.352.1%52.1%26.3%15.4% -116 dBm

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

Cell phone coverage map for Lake County, CA

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 Lake County, CA

#1

T-Mobile

Coverage Score 52.9
In Lake County, CA
Overall
46.1%
4G LTE
44.9%
5G
44.6%
Fast 5G
34.5%
Average Signal -89 dBm
#2

Verizon

Coverage Score 41.9
In Lake County, CA
Overall
52.8%
4G LTE
52.6%
5G
19.5%
Fast 5G
10.2%
Average Signal -97 dBm
#3

AT&T

Coverage Score 39.3
In Lake County, CA
Overall
52.1%
4G LTE
52.1%
5G
26.3%
Fast 5G
15.4%
Average Signal -116 dBm
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Coverage by city in Lake County, CA

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

CityVerizonAT&TT-Mobile
Clearlake, CA 100.0% 100.0% 94.7% 86.5% -84 dBm 99.6% 99.6% 89.3% 68.9% -110 dBm 100.0% 100.0% 100.0% 98.0% -83 dBm
Clearlake Oaks, CA 100.0% 100.0% 0.0% 0.0% -74 dBm 100.0% 100.0% 100.0% 98.0% -109 dBm 100.0% 100.0% 100.0% 100.0% -73 dBm
Clearlake Riviera, CA 96.7% 96.7% 35.0% 25.2% -95 dBm 100.0% 100.0% 79.7% 69.1% -118 dBm 100.0% 100.0% 100.0% 97.6% -79 dBm
Cobb, CA 100.0% 100.0% 0.8% 0.0% -79 dBm 100.0% 100.0% 96.6% 21.8% -111 dBm 99.2% 99.2% 99.2% 95.0% -78 dBm
Finley, CA 84.5% 84.1% 43.6% 23.1% -98 dBm 89.4% 89.4% 49.0% 25.7% -116 dBm 78.9% 77.2% 78.5% 63.2% -88 dBm
Glenhaven, CA 56.3% 56.1% 25.8% 7.7% -98 dBm 56.8% 56.8% 33.9% 12.4% -119 dBm 51.1% 50.6% 50.5% 44.1% -90 dBm
Hidden Valley Lake, CA 97.0% 97.0% 67.0% 9.9% -98 dBm 98.7% 98.7% 81.1% 43.8% -116 dBm 94.0% 92.7% 93.1% 81.5% -90 dBm
Kelseyville, CA 100.0% 100.0% 85.3% 63.2% -84 dBm 100.0% 100.0% 92.6% 75.0% -111 dBm 98.5% 98.5% 98.5% 95.6% -84 dBm
Lakeport, CA 100.0% 100.0% 52.1% 24.7% -91 dBm 100.0% 100.0% 80.8% 57.5% -112 dBm 100.0% 100.0% 100.0% 100.0% -77 dBm
Lower Lake, CA 100.0% 100.0% 84.4% 73.4% -83 dBm 100.0% 100.0% 68.8% 34.4% -118 dBm 100.0% 100.0% 100.0% 92.2% -83 dBm
Lucerne, CA 99.2% 99.2% 42.6% 35.7% -90 dBm 99.2% 99.2% 91.5% 44.2% -118 dBm 92.2% 92.2% 91.5% 85.3% -88 dBm
Middletown, CA 100.0% 100.0% 84.4% 68.9% -82 dBm 100.0% 100.0% 97.8% 80.0% -103 dBm 100.0% 100.0% 100.0% 100.0% -74 dBm
Nice, CA 100.0% 100.0% 90.7% 69.8% -85 dBm 100.0% 100.0% 100.0% 74.4% -104 dBm 100.0% 100.0% 100.0% 100.0% -76 dBm
North Lakeport, CA 100.0% 100.0% 68.8% 47.3% -95 dBm 100.0% 100.0% 73.1% 49.5% -116 dBm 100.0% 100.0% 100.0% 86.0% -88 dBm
Soda Bay, CA 100.0% 100.0% 43.8% 0.0% -96 dBm 100.0% 100.0% 87.5% 50.0% -115 dBm 93.8% 93.8% 93.8% 90.6% -87 dBm
Spring Valley, CA 99.2% 98.3% 75.2% 59.5% -90 dBm 34.7% 34.7% 0.0% 0.0% -120 dBm 38.8% 35.5% 36.4% 20.7% -95 dBm
Upper Lake, CA 86.4% 86.4% 40.9% 34.1% -96 dBm 100.0% 100.0% 100.0% 54.5% -110 dBm 100.0% 100.0% 100.0% 100.0% -75 dBm
Witter Springs, CA 81.0% 80.4% 24.3% 16.4% -102 dBm 83.6% 83.6% 46.0% 39.7% -118 dBm 78.8% 76.7% 76.7% 55.0% -92 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 Lake County, CA 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.