T-Mobile currently ranks first for coverage in this area, with a coverage score of 56.4. Compare Wireless Carriers uses FCC broadband map data to estimate and calculate coverage scores. More on that further below.Coverage rankings for California
| Rank | Carrier | Score | Overall | 4G LTE | 5G | Fast 5G | Average Signal |
|---|---|---|---|---|---|---|---|
| 1 | T-Mobile | 56.4 | 51.8% | 51.5% | 46.7% | 36.6% | -90 dBm |
| 2 | Verizon | 52.0 | 63.5% | 63.2% | 29.1% | 20.5% | -96 dBm |
| 3 | AT&T | 50.0 | 58.7% | 58.6% | 40.2% | 28.9% | -113 dBm |
Scores include coverage area, network type, and average signal strength.
Cell phone coverage map for California
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 California
#1
T-Mobile
Coverage Score 56.4
In California
- Overall
- 51.8%
- 4G LTE
- 51.5%
- 5G
- 46.7%
- Fast 5G
- 36.6%
Average Signal -90 dBm
#2
Verizon
Coverage Score 52.0
In California
- Overall
- 63.5%
- 4G LTE
- 63.2%
- 5G
- 29.1%
- Fast 5G
- 20.5%
Average Signal -96 dBm
#3
AT&T
Coverage Score 50.0
In California
- Overall
- 58.7%
- 4G LTE
- 58.6%
- 5G
- 40.2%
- Fast 5G
- 28.9%
Average Signal -113 dBm
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Coverage by county in California
Counties are shown for statewide comparison. Coverage percentages use land-area only coverage.
| County | Verizon | AT&T | T-Mobile |
|---|---|---|---|
| Alameda County, CA | 87.6% 87.5% 69.6% 59.0% -92 dBm | 76.1% 74.8% 64.9% 41.9% -106 dBm | 73.3% 72.5% 69.2% 57.6% -87 dBm |
| Alpine County, CA | 51.1% 51.0% 4.8% 1.5% -97 dBm | 25.9% 25.8% 18.3% 10.3% -117 dBm | 10.5% 10.2% 9.5% 7.1% -92 dBm |
| Amador County, CA | 79.7% 79.5% 35.3% 18.3% -99 dBm | 64.7% 64.5% 53.7% 30.2% -112 dBm | 50.5% 50.2% 46.5% 35.0% -89 dBm |
| Butte County, CA | 73.6% 73.4% 54.2% 38.8% -98 dBm | 65.0% 60.8% 52.2% 20.1% -113 dBm | 64.9% 64.9% 58.6% 44.5% -91 dBm |
| Calaveras County, CA | 84.5% 84.2% 36.6% 19.8% -100 dBm | 61.8% 61.6% 47.3% 23.4% -114 dBm | 61.7% 61.5% 56.8% 45.6% -89 dBm |
| Colusa County, CA | 66.1% 66.0% 31.7% 17.8% -97 dBm | 72.5% 72.1% 60.9% 29.9% -114 dBm | 59.2% 59.2% 53.2% 41.3% -93 dBm |
| Contra Costa County, CA | 97.7% 97.7% 79.3% 66.3% -90 dBm | 92.0% 91.7% 78.7% 51.9% -109 dBm | 87.8% 87.0% 82.5% 69.1% -86 dBm |
| Del Norte County, CA | 26.3% 26.3% 2.0% 1.1% -100 dBm | 13.9% 13.9% 0.7% 0.3% -113 dBm | 13.4% 13.4% 11.7% 8.8% -91 dBm |
| El Dorado County, CA | 68.3% 68.0% 36.5% 22.1% -99 dBm | 57.9% 57.4% 42.9% 20.7% -113 dBm | 52.5% 52.3% 45.8% 34.1% -91 dBm |
| Fresno County, CA | 61.7% 61.6% 34.3% 21.4% -95 dBm | 59.4% 59.2% 52.7% 26.5% -112 dBm | 56.7% 56.5% 55.5% 49.3% -88 dBm |
| Glenn County, CA | 64.4% 64.4% 27.5% 14.3% -98 dBm | 68.2% 67.3% 49.6% 26.4% -115 dBm | 48.1% 47.9% 43.9% 31.0% -93 dBm |
| Humboldt County, CA | 48.0% 47.9% 5.4% 3.5% -98 dBm | 32.5% 32.5% 5.4% 3.1% -114 dBm | 24.4% 24.0% 20.0% 13.8% -91 dBm |
| Imperial County, CA | 74.7% 73.7% 54.3% 35.5% -101 dBm | 79.5% 79.4% 19.0% 11.2% -111 dBm | 80.4% 79.8% 76.0% 62.4% -88 dBm |
| Inyo County, CA | 29.5% 29.5% 3.4% 2.1% -98 dBm | 34.7% 34.7% 16.5% 16.2% -116 dBm | 19.7% 19.3% 18.1% 14.7% -90 dBm |
| Kern County, CA | 78.3% 78.2% 41.2% 29.4% -94 dBm | 83.0% 83.0% 59.3% 56.0% -113 dBm | 81.5% 81.3% 75.8% 64.7% -89 dBm |
| Kings County, CA | 95.9% 95.8% 58.6% 35.9% -94 dBm | 94.9% 94.8% 81.9% 47.9% -112 dBm | 96.6% 96.5% 95.1% 75.6% -90 dBm |
| Lake County, CA | 52.8% 52.6% 19.5% 10.2% -97 dBm | 52.1% 52.1% 26.3% 15.4% -116 dBm | 46.1% 44.9% 44.6% 34.5% -89 dBm |
| Lassen County, CA | 60.3% 60.3% 4.3% 2.4% -95 dBm | 44.8% 44.8% 32.2% 14.7% -116 dBm | 45.0% 44.4% 40.6% 28.5% -93 dBm |
| Los Angeles County, CA | 80.6% 80.1% 66.6% 56.9% -92 dBm | 77.5% 77.5% 66.1% 61.0% -109 dBm | 78.2% 77.9% 72.9% 64.9% -85 dBm |
| Madera County, CA | 79.1% 78.9% 52.8% 32.7% -95 dBm | 72.1% 71.8% 62.8% 37.6% -112 dBm | 62.9% 62.3% 60.6% 50.8% -88 dBm |
| Marin County, CA | 81.6% 81.4% 39.2% 26.7% -98 dBm | 70.7% 70.4% 54.9% 29.5% -114 dBm | 52.2% 51.4% 41.4% 28.7% -92 dBm |
| Mariposa County, CA | 69.6% 69.5% 7.7% 4.7% -99 dBm | 42.4% 42.2% 26.1% 14.4% -117 dBm | 42.7% 42.1% 36.0% 20.7% -95 dBm |
| Mendocino County, CA | 35.2% 35.1% 4.7% 3.0% -100 dBm | 30.0% 30.0% 9.4% 5.9% -116 dBm | 23.5% 23.0% 16.8% 12.3% -91 dBm |
| Merced County, CA | 90.3% 90.3% 40.7% 20.9% -94 dBm | 88.5% 88.4% 78.4% 47.3% -112 dBm | 87.7% 87.5% 84.8% 71.5% -88 dBm |
| Modoc County, CA | 68.8% 68.7% 8.5% 4.6% -98 dBm | 39.3% 39.3% 10.2% 2.4% -116 dBm | 52.4% 52.2% 45.2% 30.8% -94 dBm |
| Mono County, CA | 46.2% 46.2% 11.9% 7.3% -97 dBm | 64.9% 64.9% 41.5% 41.0% -116 dBm | 30.2% 29.7% 26.4% 20.1% -91 dBm |
| Monterey County, CA | 63.7% 63.6% 23.2% 15.8% -97 dBm | 56.4% 56.2% 45.8% 26.1% -113 dBm | 46.8% 45.9% 43.4% 32.1% -90 dBm |
| Napa County, CA | 87.3% 87.1% 37.8% 26.3% -97 dBm | 69.2% 69.0% 45.0% 28.8% -115 dBm | 55.4% 54.5% 35.4% 22.5% -94 dBm |
| Nevada County, CA | 65.9% 65.4% 26.8% 16.4% -98 dBm | 58.8% 58.6% 45.2% 19.1% -114 dBm | 50.2% 50.1% 40.5% 27.0% -93 dBm |
| Orange County, CA | 94.4% 94.1% 86.2% 79.2% -89 dBm | 91.1% 90.3% 83.5% 79.7% -105 dBm | 86.5% 86.4% 80.7% 73.1% -83 dBm |
| Placer County, CA | 64.5% 64.4% 34.7% 27.1% -94 dBm | 55.2% 54.9% 44.7% 23.9% -111 dBm | 54.2% 54.1% 47.0% 37.2% -90 dBm |
| Plumas County, CA | 51.8% 51.8% 3.5% 1.1% -99 dBm | 36.2% 36.2% 18.0% 10.3% -118 dBm | 26.4% 25.6% 24.7% 18.1% -91 dBm |
| Riverside County, CA | 73.0% 72.3% 49.0% 38.5% -95 dBm | 75.0% 74.9% 55.0% 52.6% -113 dBm | 67.3% 67.2% 60.6% 49.4% -89 dBm |
| Sacramento County, CA | 100.0% 100.0% 89.3% 64.9% -89 dBm | 98.3% 97.3% 95.1% 58.3% -105 dBm | 99.9% 99.9% 94.0% 88.0% -84 dBm |
| San Benito County, CA | 38.6% 38.5% 10.1% 6.0% -98 dBm | 32.3% 32.2% 22.8% 12.0% -114 dBm | 34.4% 33.8% 32.4% 23.1% -89 dBm |
| San Bernardino County, CA | 71.8% 71.0% 33.0% 24.4% -97 dBm | 74.5% 74.5% 51.4% 48.5% -115 dBm | 54.8% 54.6% 48.1% 33.9% -93 dBm |
| San Diego County, CA | 77.7% 77.0% 50.6% 37.3% -100 dBm | 73.4% 73.3% 50.7% 39.5% -111 dBm | 71.7% 71.6% 59.4% 45.9% -90 dBm |
| San Francisco County, CA | 99.8% 99.8% 98.9% 92.5% -86 dBm | 99.2% 99.1% 98.3% 68.7% -95 dBm | 99.2% 99.2% 95.9% 90.1% -80 dBm |
| San Joaquin County, CA | 96.3% 96.3% 83.1% 61.0% -90 dBm | 96.6% 96.3% 91.6% 50.6% -108 dBm | 95.4% 95.4% 91.2% 79.4% -87 dBm |
| San Luis Obispo County, CA | 65.1% 64.8% 21.0% 14.7% -97 dBm | 67.7% 67.7% 43.7% 39.8% -114 dBm | 55.8% 55.7% 48.2% 35.7% -92 dBm |
| San Mateo County, CA | 80.6% 80.4% 47.3% 37.0% -93 dBm | 71.5% 71.3% 52.1% 32.4% -107 dBm | 58.1% 56.9% 53.9% 44.0% -86 dBm |
| Santa Barbara County, CA | 53.5% 53.4% 21.6% 15.5% -96 dBm | 47.1% 47.1% 29.8% 27.5% -113 dBm | 45.7% 45.6% 32.7% 23.7% -93 dBm |
| Santa Clara County, CA | 78.3% 78.0% 46.1% 33.5% -95 dBm | 61.3% 60.0% 51.7% 27.0% -108 dBm | 52.0% 51.4% 47.6% 37.7% -88 dBm |
| Santa Cruz County, CA | 80.5% 80.5% 35.0% 22.2% -98 dBm | 68.9% 68.7% 54.9% 20.9% -112 dBm | 33.8% 32.1% 31.1% 20.1% -92 dBm |
| Shasta County, CA | 61.8% 61.7% 9.9% 4.9% -99 dBm | 47.2% 47.1% 31.2% 19.8% -116 dBm | 45.5% 45.1% 38.9% 26.5% -94 dBm |
| Sierra County, CA | 35.0% 34.8% 9.8% 5.3% -98 dBm | 26.0% 25.8% 14.1% 7.8% -116 dBm | 24.6% 24.2% 22.5% 17.3% -92 dBm |
| Siskiyou County, CA | 50.0% 50.0% 7.2% 4.6% -97 dBm | 39.1% 39.1% 9.4% 3.8% -115 dBm | 34.6% 34.0% 29.4% 21.6% -93 dBm |
| Solano County, CA | 98.8% 98.8% 65.4% 42.1% -93 dBm | 93.9% 92.8% 82.3% 37.2% -113 dBm | 92.2% 91.8% 88.0% 68.3% -89 dBm |
| Sonoma County, CA | 79.7% 79.5% 43.0% 32.0% -96 dBm | 66.9% 66.6% 52.8% 26.8% -114 dBm | 57.7% 56.3% 54.0% 39.9% -90 dBm |
| Stanislaus County, CA | 81.7% 81.5% 57.9% 44.8% -93 dBm | 80.0% 79.9% 72.1% 42.7% -110 dBm | 78.1% 77.8% 75.0% 63.5% -87 dBm |
| Sutter County, CA | 98.7% 98.7% 67.3% 44.3% -93 dBm | 94.1% 92.2% 87.9% 41.9% -109 dBm | 98.1% 98.1% 94.0% 73.6% -90 dBm |
| Tehama County, CA | 59.8% 59.8% 13.4% 7.0% -99 dBm | 55.3% 55.1% 34.8% 18.5% -116 dBm | 51.7% 51.2% 47.2% 35.1% -91 dBm |
| Trinity County, CA | 30.7% 30.7% 0.0% 0.0% -100 dBm | 8.6% 8.6% 0.1% 0.0% -115 dBm | 6.3% 6.1% 3.9% 2.3% -95 dBm |
| Tulare County, CA | 47.5% 47.4% 31.1% 19.7% -95 dBm | 45.5% 45.2% 36.4% 20.4% -111 dBm | 41.7% 41.2% 40.1% 33.8% -88 dBm |
| Tuolumne County, CA | 48.9% 48.7% 17.6% 11.9% -100 dBm | 27.8% 27.7% 19.1% 8.8% -115 dBm | 27.9% 27.8% 24.0% 16.7% -92 dBm |
| Ventura County, CA | 57.4% 56.8% 43.4% 34.9% -97 dBm | 54.2% 54.2% 39.1% 35.8% -112 dBm | 53.1% 53.1% 44.9% 34.9% -91 dBm |
| Yolo County, CA | 90.6% 90.5% 63.4% 42.7% -97 dBm | 88.2% 87.4% 78.5% 33.7% -111 dBm | 91.9% 91.9% 87.3% 75.5% -88 dBm |
| Yuba County, CA | 84.8% 84.5% 63.9% 46.3% -95 dBm | 78.8% 78.1% 70.3% 29.6% -111 dBm | 71.2% 71.2% 64.9% 51.9% -90 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 California 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.