Coverage rankings for Marin County, CA
Verizon currently ranks first for coverage in this area, with a coverage score of 63.6. Compare Wireless Carriers uses FCC broadband map data to estimate and calculate coverage scores. More on that further below.
| Rank | Carrier | Score | Overall | 4G LTE | 5G | Fast 5G | Average Signal |
|---|---|---|---|---|---|---|---|
| 1 | Verizon | 63.6 | 81.6% | 81.4% | 39.2% | 26.7% | -98 dBm |
| 2 | AT&T | 57.9 | 70.7% | 70.4% | 54.9% | 29.5% | -114 dBm |
| 3 | T-Mobile | 52.9 | 52.2% | 51.4% | 41.4% | 28.7% | -92 dBm |
Scores include coverage area, network type, and average signal strength.
Cell phone coverage map for Marin 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.
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 Marin County, CA
Verizon
- Overall
- 81.6%
- 4G LTE
- 81.4%
- 5G
- 39.2%
- Fast 5G
- 26.7%
AT&T
- Overall
- 70.7%
- 4G LTE
- 70.4%
- 5G
- 54.9%
- Fast 5G
- 29.5%
T-Mobile
- Overall
- 52.2%
- 4G LTE
- 51.4%
- 5G
- 41.4%
- Fast 5G
- 28.7%
Coverage varies by neighborhood. Your carrier shouldn’t.
US Mobile lets you switch between all three major networks, so you can choose the one that works best where you actually use your phone.
Pricing, network access, switching terms, and home internet availability may vary.
Coverage by city in Marin County, CA
Cities and towns are shown for county-level comparison. Coverage percentages use land-area only coverage.
| City | Verizon | AT&T | T-Mobile |
|---|---|---|---|
| Alto, CA | 100.0% 100.0% 0.0% 0.0% -100 dBm | 100.0% 100.0% 100.0% 100.0% -100 dBm | 100.0% 100.0% 50.0% 50.0% -95 dBm |
| Belvedere, CA | 100.0% 100.0% 85.7% 42.9% -96 dBm | 100.0% 100.0% 100.0% 50.0% -104 dBm | 92.9% 92.9% 92.9% 92.9% -82 dBm |
| Belvedere Tiburon, CA | 100.0% 100.0% 76.6% 27.8% -94 dBm | 90.5% 89.9% 76.6% 20.9% -114 dBm | 92.4% 92.4% 88.0% 67.1% -91 dBm |
| Black Point-Green Point, CA | 100.0% 100.0% 79.0% 62.9% -91 dBm | 100.0% 100.0% 93.5% 75.8% -110 dBm | 88.7% 88.7% 77.4% 59.7% -91 dBm |
| Bolinas, CA | 88.5% 88.5% 46.8% 28.8% -99 dBm | 86.3% 86.3% 67.6% 63.3% -111 dBm | 15.8% 15.8% 0.0% 0.0% -105 dBm |
| Corte Madera, CA | 100.0% 100.0% 78.7% 57.3% -92 dBm | 98.7% 98.7% 98.7% 65.3% -102 dBm | 94.7% 94.7% 93.3% 80.0% -84 dBm |
| Dillon Beach, CA | 84.0% 84.0% 34.7% 29.3% -97 dBm | 70.7% 70.7% 56.0% 36.0% -112 dBm | 85.3% 85.3% 4.0% 1.3% -91 dBm |
| Fairfax, CA | 100.0% 100.0% 46.0% 22.0% -96 dBm | 100.0% 100.0% 94.0% 62.0% -114 dBm | 88.0% 86.0% 76.0% 62.0% -92 dBm |
| Forest Knolls, CA | 100.0% 100.0% 46.1% 34.2% -94 dBm | 100.0% 100.0% 94.7% 48.7% -110 dBm | 88.2% 76.3% 88.2% 59.2% -89 dBm |
| Greenbrae, CA | 100.0% 100.0% 52.1% 33.6% -93 dBm | 97.5% 97.5% 91.6% 42.9% -111 dBm | 83.2% 83.2% 72.3% 46.2% -91 dBm |
| Inverness, CA | 82.2% 80.3% 30.9% 19.7% -102 dBm | 44.1% 44.1% 30.9% 4.6% -116 dBm | 55.9% 55.9% 17.8% 5.3% -100 dBm |
| Kentfield, CA | 100.0% 100.0% 49.3% 31.0% -95 dBm | 97.2% 97.2% 85.9% 39.4% -111 dBm | 90.1% 90.1% 81.7% 49.3% -93 dBm |
| Lagunitas, CA | 87.9% 86.5% 53.4% 33.2% -96 dBm | 97.8% 97.3% 92.4% 35.9% -110 dBm | 91.5% 87.0% 90.1% 73.1% -86 dBm |
| Lagunitas-Forest Knolls, CA | 91.1% 91.1% 44.6% 33.7% -94 dBm | 99.0% 98.0% 93.1% 48.5% -111 dBm | 88.1% 80.2% 88.1% 62.4% -88 dBm |
| Larkspur, CA | 100.0% 100.0% 86.3% 75.3% -88 dBm | 100.0% 100.0% 94.5% 58.9% -111 dBm | 97.3% 97.3% 93.2% 86.3% -84 dBm |
| Lucas Valley-Marinwood, CA | 100.0% 100.0% 52.2% 36.2% -97 dBm | 80.4% 80.4% 65.9% 40.6% -112 dBm | 91.3% 89.9% 87.0% 67.4% -90 dBm |
| Marin City, CA | 100.0% 100.0% 76.9% 46.2% -94 dBm | 100.0% 100.0% 100.0% 84.6% -101 dBm | 100.0% 92.3% 76.9% 46.2% -95 dBm |
| Marshall, CA | 63.2% 62.8% 22.6% 8.8% -104 dBm | 32.9% 32.7% 20.7% 2.1% -119 dBm | 44.8% 44.8% 10.8% 3.2% -95 dBm |
| Mill Valley, CA | 100.0% 100.0% 61.4% 40.4% -96 dBm | 99.1% 99.1% 91.2% 56.1% -113 dBm | 71.1% 67.5% 55.3% 38.6% -92 dBm |
| Muir Beach, CA | 100.0% 100.0% 25.0% 25.0% -103 dBm | 100.0% 100.0% 58.3% 25.0% -118 dBm | 41.7% 41.7% 33.3% 0.0% -102 dBm |
| Nicasio, CA | 100.0% 100.0% 64.5% 48.4% -86 dBm | 100.0% 100.0% 93.5% 80.6% -106 dBm | 35.5% 32.3% 29.0% 19.4% -95 dBm |
| Novato, CA | 99.7% 99.5% 71.2% 54.3% -91 dBm | 99.4% 99.2% 89.6% 69.1% -108 dBm | 96.0% 95.0% 92.1% 80.3% -86 dBm |
| Olema, CA | 69.6% 69.2% 18.5% 14.8% -102 dBm | 54.4% 53.9% 44.9% 13.0% -116 dBm | 43.9% 43.6% 17.2% 6.9% -96 dBm |
| Point Reyes Station, CA | 81.4% 81.4% 24.4% 24.4% -99 dBm | 54.7% 54.7% 43.0% 16.3% -115 dBm | 86.0% 86.0% 27.9% 11.6% -94 dBm |
| Ross, CA | 100.0% 100.0% 47.2% 33.3% -96 dBm | 100.0% 100.0% 94.4% 33.3% -115 dBm | 91.7% 91.7% 77.8% 55.6% -93 dBm |
| San Anselmo, CA | 100.0% 100.0% 55.4% 40.0% -92 dBm | 98.5% 98.5% 98.5% 52.3% -117 dBm | 96.9% 96.9% 72.3% 29.2% -96 dBm |
| San Geronimo, CA | 100.0% 100.0% 44.4% 27.8% -99 dBm | 100.0% 100.0% 97.2% 63.9% -116 dBm | 72.2% 66.7% 72.2% 41.7% -90 dBm |
| San Quentin, CA | 100.0% 100.0% 81.8% 45.5% -95 dBm | 100.0% 100.0% 90.9% 81.8% -117 dBm | 90.9% 90.9% 81.8% 63.6% -93 dBm |
| San Rafael, CA | 99.7% 99.7% 81.7% 67.2% -90 dBm | 99.7% 99.5% 98.4% 62.3% -107 dBm | 88.6% 88.6% 81.1% 65.9% -86 dBm |
| Santa Venetia, CA | 98.8% 98.8% 78.8% 50.6% -95 dBm | 98.8% 97.6% 81.2% 35.3% -112 dBm | 69.4% 68.2% 62.4% 40.0% -94 dBm |
| Sausalito, CA | 100.0% 100.0% 84.4% 42.2% -92 dBm | 100.0% 100.0% 97.8% 60.0% -106 dBm | 95.6% 93.3% 88.9% 73.3% -83 dBm |
| Sleepy Hollow, CA | 100.0% 100.0% 81.7% 64.8% -87 dBm | 90.1% 88.7% 66.2% 23.9% -117 dBm | 91.5% 91.5% 77.5% 46.5% -95 dBm |
| Stinson Beach, CA | 100.0% 100.0% 66.7% 27.8% -96 dBm | 100.0% 100.0% 72.2% 72.2% -115 dBm | 72.2% 72.2% 0.0% 0.0% -89 dBm |
| Strawberry, CA | 100.0% 100.0% 75.8% 51.5% -92 dBm | 100.0% 100.0% 100.0% 63.6% -107 dBm | 100.0% 97.0% 100.0% 87.9% -84 dBm |
| Tamalpais-Homestead Valley, CA | 100.0% 100.0% 65.1% 50.5% -96 dBm | 75.2% 75.2% 54.1% 34.9% -117 dBm | 76.1% 73.4% 60.6% 38.5% -93 dBm |
| Tiburon, CA | 100.0% 100.0% 78.7% 27.8% -95 dBm | 89.8% 88.9% 75.0% 21.3% -114 dBm | 95.4% 95.4% 91.7% 67.6% -91 dBm |
| Tomales, CA | 100.0% 100.0% 75.0% 62.5% -103 dBm | 87.5% 87.5% 87.5% 75.0% -107 dBm | 25.0% 25.0% 12.5% 0.0% -105 dBm |
| Woodacre, CA | 100.0% 100.0% 33.3% 26.2% -99 dBm | 90.5% 90.5% 64.3% 11.9% -116 dBm | 76.2% 76.2% 76.2% 52.4% -92 dBm |
| Bloomfield, CA | 99.0% 99.0% 77.0% 58.2% -91 dBm | 38.3% 38.3% 10.7% 2.0% -120 dBm | 81.1% 81.1% 80.1% 52.6% -92 dBm |
| Bodega Bay, CA | 99.0% 99.0% 61.0% 45.0% -93 dBm | 97.5% 97.5% 93.5% 74.0% -108 dBm | 97.5% 97.5% 91.5% 85.0% -82 dBm |
| Petaluma Center, CA | 100.0% 100.0% 93.1% 93.1% -82 dBm | 100.0% 100.0% 96.6% 82.8% -102 dBm | 100.0% 100.0% 100.0% 100.0% -66 dBm |
| San Francisco, 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 |
| Valley Ford, CA | 100.0% 100.0% 57.4% 54.1% -97 dBm | 54.1% 54.1% 27.9% 1.6% -120 dBm | 95.1% 95.1% 91.8% 80.3% -82 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 Marin 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.