Find the Best Internet Providers in San Mateo CA
Compare fiber cable and 5G home internet from every provider available in San Mateo. See real pricing speeds and availability at your exact address from Downtown San Mateo to Hillsdale to the residential blocks throughout this Peninsula city.
Serving San Mateo zip codes 94401, 94402, 94403, and 94404.
4
Providers Available
4
Neighborhoods Covered
4
Zip Codes
$30/mo
Starting Price/mo
Internet Providers Available in San Mateo CA
| Provider | Price | Speed | Type | Data Cap | Contract | Best For | |
|---|---|---|---|---|---|---|---|
| Xfinity | $30/mo | 2 Gbps | Cable | 1.2 TB | None | 99% San Mateo cable coverage | View Plans |
| AT&T Fiber | $55/mo | 5 Gbps | Fiber | None | None | Approximately 54% San Mateo fiber coverage with symmetric speeds | View Plans |
| Sonic | $49.99/mo | 10 Gbps | Fiber | None | None | Approximately 25% San Mateo fiber — locally-favored choice where available | View Plans |
| T-Mobile Home Internet | $50/mo | ~245 Mbps | 5G Home | None | None | Available in San Mateo | View Plans |
Provider availability on this page is verified against the FCC National Broadband Map (June 2025 data). Coverage is provider-reported and updated periodically.
Best Internet Providers in San Mateo CA
Xfinity
With cable reaching around 99% of San Mateo, Xfinity is the everyday default for most households here. Speeds run from $30/mo for 75 Mbps up to 2 Gbps; the 1.2 TB data cap is generous for typical use and liftable with an unlimited add-on. Qualifying households can get Internet Essentials at $9.95/mo. Call (888) 224-5870 for pricing at your address.
View Plans
AT&T Fiber
AT&T Fiber has approximately 54 percent coverage in San Mateo. Plans start at $55/mo for 300 Mbps and go up to 5 Gbps with symmetric upload and download speeds. San Mateo is a Peninsula city of approximately 105000 residents — anchored by Downtown San Mateo's commercial core substantial financial-services industry presence (Franklin Templeton GoPro and other companies have major facilities) College of San Mateo notable Caltrain commuter character (the San Mateo Caltrain station serves commuters to SF and the South Bay) and proximity to SFO airport. The city has notable Hispanic-American and Asian-American populations plus substantial commuter household population. Many San Mateo households qualify for Xfinity Internet Essentials at $9.95/mo. Call (888) 224-5870 for current pricing.
View Plans
Sonic
Sonic has approximately 25 percent fiber coverage in San Mateo. Plans start at $49.99/mo for 1 Gbps and go up to 10 Gbps with symmetric speeds no data caps no contracts. Sonic is a genuine local Northern California company with substantially better-rated customer service than national providers. Where available it is often the best choice. Call (888) 224-5870 to check Sonic at your San Mateo address.
View Plans
T-Mobile Home Internet
T-Mobile Home Internet is available to around 74% of San Mateo and is the easiest wired-free option in town — a strong fit for renters or anyone skipping an installation appointment. The 5G gateway ships in one to three days and self-installs in about 15 minutes: no technician, no drilling. Typical speeds run 150-245 Mbps depending on tower load, fine for streaming, calls, and everyday work. Flat $50/mo, no contract, no data cap. Call (888) 224-5870 for an address-specific read.
View Plans
San Mateo Neighborhoods We Cover
Internet Service by San Mateo Neighborhood
Downtown San Mateo
Hillsdale
Hayward Park
Sugarloaf
Internet in San Mateo — What You Need to Know
San Mateo Is NOT a Spectrum Market
For San Mateo households researching internet: Spectrum does not operate in San Mateo. The cable provider is Xfinity (Comcast). The fiber providers are AT&T Fiber Sonic and Astound Broadband. For San Mateo households the practical wired internet decisions are AT&T Fiber vs Xfinity cable — with Sonic fiber and Astound as strong alternatives where available. AT&T Fiber where available is typically the better wired choice — symmetric speeds and no data caps. Call (888) 224-5870 to check what reaches your specific San Mateo address.
Peninsula Commuter and SFO-Adjacent Households
San Mateo has substantial Peninsula commuter household population — the San Mateo Caltrain station provides direct service to SF and the South Bay so many residents commute to tech jobs in SF Mountain View Palo Alto and Sunnyvale. For commuters working from home on hybrid schedules fiber's symmetric upload speeds matter for video calls cloud-based work and uploading work files — AT&T Fiber at $55/mo with symmetric speeds is meaningfully better than Xfinity cable's 35 Mbps upload cap. The city's SFO airport proximity also creates substantial airline industry household population. EarthLink fiber at $39.95/mo on AT&T infrastructure offers comparable performance with stronger privacy. Call (888) 224-5870 for a commuter setup.
Astound Broadband — A Bay Area Regional Alternative
San Mateo has a meaningful fourth wired option that most California cities don't: Astound Broadband (formerly Wave Broadband). Coverage is limited (approximately 6 percent fiber) but where available Astound offers cable and fiber service with no data caps and competitive pricing starting at $30/mo. Astound is a Bay Area regional provider with meaningful presence in San Mateo Daly City and parts of the Peninsula. For households who want an alternative to the national providers Astound is worth checking. Call (888) 224-5870 to check at your specific San Mateo address.
Not sure which provider reaches your San Mateo address?
Our agents check availability instantly and get you connected same day.
Internet Providers by Location
Burlingame
CA
›
Foster City
CA
›
Belmont
CA
›
Hillsborough
CA
›
San Carlos
CA
›
Millbrae
CA
›
Redwood City
CA
›
San Bruno
CA
›
South San Francisco
CA
›
Half Moon Bay
CA
›
Frequently Asked Questions About Internet in San Mateo CA
For most San Mateo households AT&T Fiber at $55/mo for 300 Mbps with symmetric speeds is the best choice where available (54 percent coverage). Xfinity at $30/mo with 99 percent cable coverage is the broadly available alternative — but watch the 1.2 TB monthly data cap. Sonic fiber at $49.99/mo is the locally-favored choice where available (25 percent coverage). Astound Broadband at $30/mo has limited but meaningful coverage. Many San Mateo households qualify for Xfinity Internet Essentials at $9.95/mo. Call (888) 224-5870 to check all four at your San Mateo address.
No — Spectrum does not operate in San Mateo. The cable provider is Xfinity (Comcast). The fiber providers are AT&T Fiber Sonic and Astound Broadband. Call (888) 224-5870 for San Mateo-specific recommendations.
Astound Broadband (formerly Wave Broadband) is a Bay Area regional provider with limited but meaningful coverage in parts of San Mateo. Plans start at $30/mo with no data caps. Coverage in San Mateo is approximately 6 percent for fiber — worth checking at your specific address. Call (888) 224-5870 to check Astound at your San Mateo address.
For San Mateo households where AT&T Fiber is available it is usually the better choice — symmetric upload speeds and no data caps (Xfinity has a 1.2 TB monthly cap). Call (888) 224-5870 to compare.
For San Mateo Caltrain commuters working from home on hybrid schedules AT&T Fiber at $55/mo with symmetric speeds is the right answer. Upload performance matters for video calls cloud-based work and uploading work files. EarthLink fiber at $39.95/mo on AT&T infrastructure offers comparable performance with stronger privacy. Call (888) 224-5870 for a hybrid-work setup.
Yes — Xfinity imposes a 1.2 TB monthly data cap on standard plans in San Mateo. An unlimited data option is available for an additional monthly fee (typically $30/mo). For heavy-use households AT&T Fiber Sonic or Astound where available are meaningfully better because none have data caps. Call (888) 224-5870 to compare all-in pricing.
Many San Mateo households qualify. Eligibility includes households with K-12 students receiving free or reduced-price lunch SNAP recipients Medicaid recipients SSI for those 65 and older Veterans Pension Benefit and several other federal assistance programs. The program offers 75 Mbps at $9.95/mo. Call (888) 224-5870 for the eligibility check.
Call us at (888) 224-5870. We confirm the new provider is available at your specific San Mateo address (which matters since AT&T Fiber Sonic Astound and Xfinity each serve different parts of the city) schedule the installation and make sure your current service stays active until the new connection is up and tested. Most San Mateo switches complete within 1 to 5 business days. Never cancel your current internet before the new one is confirmed working.
Ready to Get the Best Internet Deal in San Mateo CA?
Enter your zip code and compare every available provider at your address in minutes. Our experts are standing by.