The West Coast has no official boundary. Here it means the three Pacific states of the lower 48: California, Oregon and Washington.
Verizon is the clear outdoor leader in all 3 states. County by county, Verizon leads in the most (80 of 133).
Every state on the West Coast
In a car, AT&T leads in 1, and 2 have no clear leader.
| State | AT&T | T-Mobile | Verizon | Outdoor leader | In-car leader | |
|---|---|---|---|---|---|---|
| California | 57.3% | 51.4% | 64.3% | Verizon (AT&T close behind) | No clear leader on land (4.8% water) | View → |
| Oregon | 54.3% | 37.6% | 59.8% | Verizon (AT&T close behind) | AT&T | View → |
| Washington | 55.2% | 50.7% | 63.6% | Verizon (AT&T close behind) | No clear leader on land (6.8% water) | View → |
Source: FCC National Broadband Map, carrier filings as of December 31, 2025. Share of area where each carrier reports 4G LTE or 5G to a phone outdoors. Carrier-reported, not measured.
The largest cities on the West Coast
76 of the 300 largest US cities are on the West Coast: 63 in California, 5 in Oregon and 8 in Washington. In 38 of them no carrier pulls clear outdoors or in a car. Below are the 20 biggest of the 38 where one does.
| City | AT&T | T-Mobile | Verizon | Water | Outdoor leader | In-car leader | |
|---|---|---|---|---|---|---|---|
| San Diego, CA | 85.1% | 85.5% | 99.4% | 12.4% | No clear leader on land (12.4% water) | Verizon (AT&T close behind) | View → |
| San Jose, CA | 93.9% | 91.1% | 97.9% | 1.7% | Verizon (AT&T close behind) | Verizon (AT&T close behind) | View → |
| Fresno, CA | 99.8% | 100% | 100% | 1% | Tie (within 5 points) | Verizon (AT&T close behind) | View → |
| Oakland, CA | 71.5% | 69% | 100% | 28.3% | No clear leader on land (28.3% water) | Verizon (AT&T close behind) | View → |
| Riverside, CA | 100% | 99.9% | 100% | 0.4% | Tie (within 5 points) | Verizon (AT&T close behind) | View → |
| Irvine, CA | 100% | 99% | 100% | 0.5% | Tie (within 5 points) | AT&T (Verizon close behind) | View → |
| Spokane, WA | 99.6% | 100% | 100% | 1.1% | Tie (within 5 points) | AT&T (Verizon close behind) | View → |
| Santa Clarita, CA | 98.3% | 99.1% | 98.1% | 0.1% | Tie (within 5 points) | AT&T | View → |
| Fremont, CA | 79.9% | 87.4% | 100% | 11.5% | Verizon (T-Mobile close behind) | Verizon | View → |
| San Bernardino, CA | 99.2% | 99.1% | 100% | 0.5% | Tie (within 5 points) | Verizon | View → |
| Glendale, CA | 99.9% | 100% | 100% | 0.4% | Tie (within 5 points) | Verizon (T-Mobile close behind) | View → |
| Ontario, CA | 100% | 99.9% | 100% | 0.1% | Tie (within 5 points) | Verizon (AT&T close behind) | View → |
| Elk Grove, CA | 99.4% | 100% | 100% | 0.5% | Tie (within 5 points) | AT&T (T-Mobile close behind) | View → |
| Eugene, OR | 100% | 100% | 100% | 0.2% | Tie (within 5 points) | AT&T (Verizon close behind) | View → |
| Santa Rosa, CA | 98.4% | 99.6% | 100% | 0.4% | Tie (within 5 points) | Verizon | View → |
| Rancho Cucamonga, CA | 100% | 100% | 100% | 0% | Tie (within 5 points) | AT&T (Verizon close behind) | View → |
| Oceanside, CA | 99.7% | 99.6% | 100% | 2.1% | Tie (within 5 points) | Verizon (AT&T close behind) | View → |
| Palmdale, CA | 99.1% | 99.5% | 98.3% | 0.2% | Tie (within 5 points) | T-Mobile (AT&T close behind) | View → |
| Hayward, CA | 60.3% | 65.2% | 99.9% | 28.5% | Verizon | Verizon | View → |
| Sunnyvale, CA | 96.3% | 96.5% | 100% | 3.2% | Tie (within 5 points) | Verizon (AT&T close behind) | View → |
County by county
133 counties where all three carriers file; in 72 even the best carrier leaves 25%+ of the land uncovered.
| Carrier | Counties led, outdoors | Counties led, in a car |
|---|---|---|
| Verizon | 80 | 17 |
| AT&T | 23 | 66 |
| T-Mobile | 1 | 2 |
| No clear leader | 29 | 48 |
The least-covered counties on the West Coast
Ranked by the share of land with 4G from any carrier; counties a fifth or more water are left out.
| County | 4G, any carrier | AT&T | T-Mobile | Verizon | Leader |
|---|---|---|---|---|---|
| Wallowa County, OR | 30.7% | 24% | 16.2% | 22.1% | AT&T (Verizon close behind) |
| Skamania County, WA | 31.1% | 22.2% | 15.4% | 13.9% | AT&T |
| Trinity County, CA | 35.7% | 8.8% | 6.2% | 34.4% | Verizon |
| Inyo County, CA | 40.3% | 34.3% | 20.6% | 30.3% | AT&T (Verizon close behind) |
| Chelan County, WA | 41.1% | 31.6% | 26.2% | 35.6% | Verizon (AT&T close behind) |
5G across the West Coast
5G at 35/3 Mbps, any carrier: California 47.7%, Oregon 25.3%, the US 39.4%.