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

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

Coverage rankings for Santa Clara County, CA

Verizon currently ranks first for coverage in this area, with a coverage score of 66.2. Compare Wireless Carriers uses FCC broadband map data to estimate and calculate coverage scores. More on that further below.

RankCarrierScoreOverall4G LTE5GFast 5GAverage Signal
1Verizon66.278.3%78.0%46.1%33.5% -95 dBm
2T-Mobile57.352.0%51.4%47.6%37.7% -88 dBm
3AT&T53.961.3%60.0%51.7%27.0% -108 dBm

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

Cell phone coverage map for Santa Clara 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 Santa Clara County, CA

#1

Verizon

Coverage Score 66.2
In Santa Clara County, CA
Overall
78.3%
4G LTE
78.0%
5G
46.1%
Fast 5G
33.5%
Average Signal -95 dBm
#2

T-Mobile

Coverage Score 57.3
In Santa Clara County, CA
Overall
52.0%
4G LTE
51.4%
5G
47.6%
Fast 5G
37.7%
Average Signal -88 dBm
#3

AT&T

Coverage Score 53.9
In Santa Clara County, CA
Overall
61.3%
4G LTE
60.0%
5G
51.7%
Fast 5G
27.0%
Average Signal -108 dBm
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Coverage by city in Santa Clara County, CA

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

CityVerizonAT&TT-Mobile
Alum Rock, CA 100.0% 100.0% 100.0% 71.4% -93 dBm 95.2% 95.2% 85.7% 47.6% -100 dBm 100.0% 100.0% 100.0% 100.0% -81 dBm
Alviso, CA 100.0% 100.0% 100.0% 97.3% -89 dBm 83.4% 54.3% 78.0% 64.1% -110 dBm 98.7% 98.7% 98.7% 90.6% -90 dBm
Burbank, CA 100.0% 100.0% 100.0% 90.0% -90 dBm 100.0% 100.0% 90.0% 50.0% -104 dBm 100.0% 100.0% 100.0% 100.0% -76 dBm
Cambrian Park, CA 100.0% 100.0% 100.0% 88.9% -84 dBm 94.4% 94.4% 77.8% 22.2% -108 dBm 100.0% 100.0% 100.0% 94.4% -94 dBm
Campbell, CA 100.0% 100.0% 95.2% 75.2% -87 dBm 100.0% 99.3% 98.6% 69.0% -103 dBm 100.0% 100.0% 100.0% 98.6% -79 dBm
Coyote, CA 100.0% 100.0% 95.1% 82.9% -83 dBm 100.0% 100.0% 100.0% 80.5% -95 dBm 100.0% 100.0% 100.0% 95.1% -82 dBm
Cupertino, CA 100.0% 100.0% 94.0% 86.5% -92 dBm 94.4% 93.6% 90.6% 53.4% -100 dBm 96.6% 96.6% 93.6% 79.7% -86 dBm
East Foothills, CA 100.0% 100.0% 93.6% 76.6% -92 dBm 74.5% 68.1% 66.0% 10.6% -106 dBm 100.0% 100.0% 100.0% 95.7% -88 dBm
Fruitdale, CA 100.0% 100.0% 100.0% 100.0% -87 dBm 100.0% 100.0% 100.0% 100.0% -96 dBm 100.0% 100.0% 100.0% 100.0% -80 dBm
Gilroy, CA 100.0% 100.0% 84.1% 56.3% -90 dBm 99.5% 99.5% 97.4% 67.7% -99 dBm 99.5% 99.5% 78.9% 59.4% -89 dBm
Lexington Hills, CA 96.4% 96.4% 73.0% 54.1% -93 dBm 96.4% 96.4% 91.9% 54.1% -109 dBm 81.1% 80.2% 77.5% 44.1% -95 dBm
Los Altos, CA 100.0% 100.0% 93.6% 67.5% -89 dBm 100.0% 100.0% 98.1% 72.0% -101 dBm 99.4% 99.4% 96.2% 72.0% -90 dBm
Los Altos Hills, CA 99.5% 99.5% 77.5% 54.9% -93 dBm 88.3% 87.8% 81.2% 51.6% -102 dBm 95.8% 95.8% 86.9% 70.0% -89 dBm
Los Gatos, CA 100.0% 100.0% 85.9% 68.4% -89 dBm 90.5% 87.8% 85.6% 51.0% -102 dBm 97.3% 97.3% 97.0% 88.2% -85 dBm
Loyola, CA 100.0% 100.0% 86.2% 72.4% -88 dBm 96.6% 96.6% 93.1% 58.6% -100 dBm 100.0% 100.0% 96.6% 79.3% -88 dBm
Milpitas, CA 99.4% 99.4% 92.8% 82.4% -85 dBm 93.4% 92.5% 89.0% 59.4% -100 dBm 95.0% 95.0% 92.5% 90.3% -80 dBm
Monte Sereno, CA 100.0% 100.0% 51.3% 25.6% -94 dBm 100.0% 97.4% 97.4% 43.6% -102 dBm 100.0% 97.4% 97.4% 64.1% -92 dBm
Morgan Hill, CA 99.7% 99.7% 79.3% 46.3% -92 dBm 100.0% 99.7% 99.3% 71.3% -102 dBm 95.0% 95.0% 93.3% 85.3% -84 dBm
Mount Hamilton, CA 65.0% 64.9% 13.0% 9.0% -103 dBm 9.8% 9.5% 2.9% 0.0% -119 dBm 3.4% 2.7% 3.1% 0.3% -101 dBm
Mountain View, CA 100.0% 100.0% 100.0% 93.5% -82 dBm 100.0% 99.6% 99.3% 81.8% -99 dBm 100.0% 100.0% 100.0% 95.6% -82 dBm
Palo Alto, CA 94.2% 94.2% 75.4% 55.6% -93 dBm 81.3% 80.5% 68.8% 54.4% -103 dBm 82.0% 81.9% 78.9% 61.6% -89 dBm
San Jose, CA 97.5% 97.5% 85.8% 74.3% -90 dBm 94.8% 92.2% 90.4% 60.8% -103 dBm 92.0% 91.8% 90.4% 82.9% -84 dBm
San Martin, CA 100.0% 100.0% 100.0% 85.9% -88 dBm 100.0% 100.0% 98.9% 60.6% -100 dBm 100.0% 100.0% 97.8% 87.0% -84 dBm
Santa Clara, CA 100.0% 100.0% 98.6% 91.0% -83 dBm 100.0% 100.0% 99.5% 76.6% -97 dBm 100.0% 100.0% 99.8% 97.0% -79 dBm
Saratoga, CA 100.0% 100.0% 90.7% 66.1% -91 dBm 95.7% 95.0% 84.4% 45.2% -105 dBm 89.4% 89.4% 87.0% 67.1% -88 dBm
Stanford, CA 100.0% 100.0% 69.2% 40.0% -91 dBm 100.0% 100.0% 96.9% 70.8% -95 dBm 96.9% 95.4% 96.9% 80.0% -90 dBm
Sunnyvale, CA 100.0% 100.0% 95.6% 82.8% -85 dBm 99.4% 98.7% 97.3% 76.3% -99 dBm 100.0% 100.0% 99.8% 96.9% -81 dBm
East Palo Alto, CA 100.0% 100.0% 100.0% 100.0% -80 dBm 98.3% 98.3% 98.3% 79.7% -99 dBm 98.3% 98.3% 98.3% 96.6% -80 dBm
Fremont, CA 100.0% 100.0% 95.0% 83.4% -90 dBm 87.3% 78.5% 81.6% 53.5% -103 dBm 98.1% 98.1% 96.2% 82.7% -87 dBm
Interlaken, CA 100.0% 100.0% 97.3% 79.1% -87 dBm 100.0% 100.0% 100.0% 48.0% -105 dBm 95.1% 92.0% 94.2% 77.3% -89 dBm
Ladera, CA 100.0% 100.0% 90.9% 45.5% -101 dBm 100.0% 100.0% 100.0% 90.9% -110 dBm 100.0% 100.0% 100.0% 100.0% -92 dBm
Menlo Park, CA 100.0% 100.0% 96.3% 86.3% -86 dBm 99.2% 98.3% 99.2% 83.8% -98 dBm 99.6% 99.2% 99.6% 95.9% -83 dBm
Portola Valley, CA 99.5% 99.5% 32.7% 17.1% -93 dBm 92.4% 91.5% 42.7% 11.8% -110 dBm 85.8% 84.8% 80.1% 50.7% -91 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 Santa Clara 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.