Cell phone coverage map for California
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Darker areas mean the carrier covers more of that location.
Map data © OpenStreetMap contributors, © CARTO. Rendered with MapLibre. FCC BDC mobile coverage processed by Carrierlytics.
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Cell phone coverage rankings by network in California
#1
T-Mobile
Coverage Score
59.4
In California
- Overall
- 51.8%
- 4G LTE
- 51.5% avg. -93 dBm 4G LTE signal where 4G LTE coverage exists: avg. -93 dBm
- 5G
- 46.7% avg. -88 dBm 5G signal where 5G coverage exists: avg. -88 dBm
- Fast 5G
- 36.6% avg. -86 dBm Fast 5G signal where Fast 5G coverage exists: avg. -86 dBm
#2
Verizon
Coverage Score
54.5
In California
- Overall
- 63.5%
- 4G LTE
- 63.2% avg. -94 dBm 4G LTE signal where 4G LTE coverage exists: avg. -94 dBm
- 5G
- 29.1% avg. -94 dBm 5G signal where 5G coverage exists: avg. -94 dBm
- Fast 5G
- 20.5% avg. -90 dBm Fast 5G signal where Fast 5G coverage exists: avg. -90 dBm
#3
AT&T
Coverage Score
45.3
In California
- Overall
- 58.7%
- 4G LTE
- 58.6% avg. -108 dBm 4G LTE signal where 4G LTE coverage exists: avg. -108 dBm
- 5G
- 40.2% avg. -112 dBm 5G signal where 5G coverage exists: avg. -112 dBm
- Fast 5G
- 28.9% avg. -111 dBm Fast 5G signal where Fast 5G coverage exists: avg. -111 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% | 76.1% 74.8% 64.9% 41.9% | 73.3% 72.5% 69.2% 57.6% |
| Alpine County, CA | 51.1% 51.0% 4.8% 1.5% | 25.9% 25.8% 18.3% 10.3% | 10.5% 10.2% 9.5% 7.1% |
| Amador County, CA | 79.7% 79.5% 35.3% 18.3% | 64.7% 64.5% 53.7% 30.2% | 50.5% 50.2% 46.5% 35.0% |
| Butte County, CA | 73.6% 73.4% 54.2% 38.8% | 65.0% 60.8% 52.2% 20.1% | 64.9% 64.9% 58.6% 44.5% |
| Calaveras County, CA | 84.5% 84.2% 36.6% 19.8% | 61.8% 61.6% 47.3% 23.4% | 61.7% 61.5% 56.8% 45.6% |
| Colusa County, CA | 66.1% 66.0% 31.7% 17.8% | 72.5% 72.1% 60.9% 29.9% | 59.2% 59.2% 53.2% 41.3% |
| Contra Costa County, CA | 97.7% 97.7% 79.3% 66.3% | 92.0% 91.7% 78.7% 51.9% | 87.8% 87.0% 82.5% 69.1% |
| Del Norte County, CA | 26.3% 26.3% 2.0% 1.1% | 13.9% 13.9% 0.7% 0.3% | 13.4% 13.4% 11.7% 8.8% |
| El Dorado County, CA | 68.3% 68.0% 36.5% 22.1% | 57.9% 57.4% 42.9% 20.7% | 52.5% 52.3% 45.8% 34.1% |
| Fresno County, CA | 61.7% 61.6% 34.3% 21.4% | 59.4% 59.2% 52.7% 26.5% | 56.7% 56.5% 55.5% 49.3% |
| Glenn County, CA | 64.4% 64.4% 27.5% 14.3% | 68.2% 67.3% 49.6% 26.4% | 48.1% 47.9% 43.9% 31.0% |
| Humboldt County, CA | 48.0% 47.9% 5.4% 3.5% | 32.5% 32.5% 5.4% 3.1% | 24.4% 24.0% 20.0% 13.8% |
| Imperial County, CA | 74.7% 73.7% 54.3% 35.5% | 79.5% 79.4% 19.0% 11.2% | 80.4% 79.8% 76.0% 62.4% |
| Inyo County, CA | 29.5% 29.5% 3.4% 2.1% | 34.7% 34.7% 16.5% 16.2% | 19.7% 19.3% 18.1% 14.7% |
| Kern County, CA | 78.3% 78.2% 41.2% 29.4% | 83.0% 83.0% 59.3% 56.0% | 81.5% 81.3% 75.8% 64.7% |
| Kings County, CA | 95.9% 95.8% 58.6% 35.9% | 94.9% 94.8% 81.9% 47.9% | 96.6% 96.5% 95.1% 75.6% |
| Lake County, CA | 52.8% 52.6% 19.5% 10.2% | 52.1% 52.1% 26.3% 15.4% | 46.1% 44.9% 44.6% 34.5% |
| Lassen County, CA | 60.3% 60.3% 4.3% 2.4% | 44.8% 44.8% 32.2% 14.7% | 45.0% 44.4% 40.6% 28.5% |
| Los Angeles County, CA | 80.6% 80.1% 66.6% 56.9% | 77.5% 77.5% 66.1% 61.0% | 78.2% 77.9% 72.9% 64.9% |
| Madera County, CA | 79.1% 78.9% 52.8% 32.7% | 72.1% 71.8% 62.8% 37.6% | 62.9% 62.3% 60.6% 50.8% |
| Marin County, CA | 81.6% 81.4% 39.2% 26.7% | 70.7% 70.4% 54.9% 29.5% | 52.2% 51.4% 41.4% 28.7% |
| Mariposa County, CA | 69.6% 69.5% 7.7% 4.7% | 42.4% 42.2% 26.1% 14.4% | 42.7% 42.1% 36.0% 20.7% |
| Mendocino County, CA | 35.2% 35.1% 4.7% 3.0% | 30.0% 30.0% 9.4% 5.9% | 23.5% 23.0% 16.8% 12.3% |
| Merced County, CA | 90.3% 90.3% 40.7% 20.9% | 88.5% 88.4% 78.4% 47.3% | 87.7% 87.5% 84.8% 71.5% |
| Modoc County, CA | 68.8% 68.7% 8.5% 4.6% | 39.3% 39.3% 10.2% 2.4% | 52.4% 52.2% 45.2% 30.8% |
| Mono County, CA | 46.2% 46.2% 11.9% 7.3% | 64.9% 64.9% 41.5% 41.0% | 30.2% 29.7% 26.4% 20.1% |
| Monterey County, CA | 63.7% 63.6% 23.2% 15.8% | 56.4% 56.2% 45.8% 26.1% | 46.8% 45.9% 43.4% 32.1% |
| Napa County, CA | 87.3% 87.1% 37.8% 26.3% | 69.2% 69.0% 45.0% 28.8% | 55.4% 54.5% 35.4% 22.5% |
| Nevada County, CA | 65.9% 65.4% 26.8% 16.4% | 58.8% 58.6% 45.2% 19.1% | 50.2% 50.1% 40.5% 27.0% |
| Orange County, CA | 94.4% 94.1% 86.2% 79.2% | 91.1% 90.3% 83.5% 79.7% | 86.5% 86.4% 80.7% 73.1% |
| Placer County, CA | 64.5% 64.4% 34.7% 27.1% | 55.2% 54.9% 44.7% 23.9% | 54.2% 54.1% 47.0% 37.2% |
| Plumas County, CA | 51.8% 51.8% 3.5% 1.1% | 36.2% 36.2% 18.0% 10.3% | 26.4% 25.6% 24.7% 18.1% |
| Riverside County, CA | 73.0% 72.3% 49.0% 38.5% | 75.0% 74.9% 55.0% 52.6% | 67.3% 67.2% 60.6% 49.4% |
| Sacramento County, CA | 100.0% 100.0% 89.3% 64.9% | 98.3% 97.3% 95.1% 58.3% | 99.9% 99.9% 94.0% 88.0% |
| San Benito County, CA | 38.6% 38.5% 10.1% 6.0% | 32.3% 32.2% 22.8% 12.0% | 34.4% 33.8% 32.4% 23.1% |
| San Bernardino County, CA | 71.8% 71.0% 33.0% 24.4% | 74.5% 74.5% 51.4% 48.5% | 54.8% 54.6% 48.1% 33.9% |
| San Diego County, CA | 77.7% 77.0% 50.6% 37.3% | 73.4% 73.3% 50.7% 39.5% | 71.7% 71.6% 59.4% 45.9% |
| San Francisco County, CA | 99.8% 99.8% 98.9% 92.5% | 99.2% 99.1% 98.3% 68.7% | 99.2% 99.2% 95.9% 90.1% |
| San Joaquin County, CA | 96.3% 96.3% 83.1% 61.0% | 96.6% 96.3% 91.6% 50.6% | 95.4% 95.4% 91.2% 79.4% |
| San Luis Obispo County, CA | 65.1% 64.8% 21.0% 14.7% | 67.7% 67.7% 43.7% 39.8% | 55.8% 55.7% 48.2% 35.7% |
| San Mateo County, CA | 80.6% 80.4% 47.3% 37.0% | 71.5% 71.3% 52.1% 32.4% | 58.1% 56.9% 53.9% 44.0% |
| Santa Barbara County, CA | 53.5% 53.4% 21.6% 15.5% | 47.1% 47.1% 29.8% 27.5% | 45.7% 45.6% 32.7% 23.7% |
| Santa Clara County, CA | 78.3% 78.0% 46.1% 33.5% | 61.3% 60.0% 51.7% 27.0% | 52.0% 51.4% 47.6% 37.7% |
| Santa Cruz County, CA | 80.5% 80.5% 35.0% 22.2% | 68.9% 68.7% 54.9% 20.9% | 33.8% 32.1% 31.1% 20.1% |
| Shasta County, CA | 61.8% 61.7% 9.9% 4.9% | 47.2% 47.1% 31.2% 19.8% | 45.5% 45.1% 38.9% 26.5% |
| Sierra County, CA | 35.0% 34.8% 9.8% 5.3% | 26.0% 25.8% 14.1% 7.8% | 24.6% 24.2% 22.5% 17.3% |
| Siskiyou County, CA | 50.0% 50.0% 7.2% 4.6% | 39.1% 39.1% 9.4% 3.8% | 34.6% 34.0% 29.4% 21.6% |
| Solano County, CA | 98.8% 98.8% 65.4% 42.1% | 93.9% 92.8% 82.3% 37.2% | 92.2% 91.8% 88.0% 68.3% |
| Sonoma County, CA | 79.7% 79.5% 43.0% 32.0% | 66.9% 66.6% 52.8% 26.8% | 57.7% 56.3% 54.0% 39.9% |
| Stanislaus County, CA | 81.7% 81.5% 57.9% 44.8% | 80.0% 79.9% 72.1% 42.7% | 78.1% 77.8% 75.0% 63.5% |
| Sutter County, CA | 98.7% 98.7% 67.3% 44.3% | 94.1% 92.2% 87.9% 41.9% | 98.1% 98.1% 94.0% 73.6% |
| Tehama County, CA | 59.8% 59.8% 13.4% 7.0% | 55.3% 55.1% 34.8% 18.5% | 51.7% 51.2% 47.2% 35.1% |
| Trinity County, CA | 30.7% 30.7% 0.0% 0.0% | 8.6% 8.6% 0.1% 0.0% | 6.3% 6.1% 3.9% 2.3% |
| Tulare County, CA | 47.5% 47.4% 31.1% 19.7% | 45.5% 45.2% 36.4% 20.4% | 41.7% 41.2% 40.1% 33.8% |
| Tuolumne County, CA | 48.9% 48.7% 17.6% 11.9% | 27.8% 27.7% 19.1% 8.8% | 27.9% 27.8% 24.0% 16.7% |
| Ventura County, CA | 57.4% 56.8% 43.4% 34.9% | 54.2% 54.2% 39.1% 35.8% | 53.1% 53.1% 44.9% 34.9% |
| Yolo County, CA | 90.6% 90.5% 63.4% 42.7% | 88.2% 87.4% 78.5% 33.7% | 91.9% 91.9% 87.3% 75.5% |
| Yuba County, CA | 84.8% 84.5% 63.9% 46.3% | 78.8% 78.1% 70.3% 29.6% | 71.2% 71.2% 64.9% 51.9% |
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.