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There are 15 residential internet providers available in San Mateo, CA (ZIP 94403), including Sonic, AT&T Fiber, Xfinity Fiber. The table below lists each provider with its technology type, maximum advertised speeds, and area coverage, sourced from the FCC National Broadband Map.
| Provider | Technology | Max download | Max upload | Area coverage |
|---|---|---|---|---|
| Sonic | Fiber | 10 Gbps | 10 Gbps | 37% |
| AT&T Fiber | Fiber | 5 Gbps | 5 Gbps | 78% |
| Xfinity Fiber | Fiber | 5 Gbps | 5 Gbps | 2% |
| Astound Fiber | Fiber | 1.5 Gbps | 1.5 Gbps | 4% |
| Xfinity | Cable | 2 Gbps | 250 Mbps | 84% |
| Astound | Cable | 1.5 Gbps | 50 Mbps | 76% |
| Verizon 5G Home | 5G Home Internet | 1 Gbps | 75 Mbps | 37% |
| T-Mobile Home Internet | 5G Home Internet | 100 Mbps | 20 Mbps | 81% |
| AT&T Internet Air | 5G Home Internet | 100 Mbps | 20 Mbps | 71% |
| Sail Internet | Fixed Wireless | 200 Mbps | 100 Mbps | 1% |
| Starlink | Satellite | 280 Mbps | 30 Mbps | 100% |
| Viasat | Satellite | 150 Mbps | 3 Mbps | 100% |
| HughesNet | Satellite | 100 Mbps | 5 Mbps | 100% |
| Astound | DSL | 1 Gbps | 10 Mbps | 4% |
| AT&T Internet | DSL | 100 Mbps | 20 Mbps | 42% |
* Starting prices and promotions shown are indicative national offers for select major providers, as of May 2026. Actual pricing varies by address, plan, and promotion, and changes frequently — most intro rates require AutoPay/paperless and exclude taxes & fees. Confirm current pricing and offers directly with the provider before ordering. See our Disclaimer.
Coverage data sourced live from our national broadband dataset (Dec 2024). Try a popular ZIP:
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