AT&T Fiber is available in San Marcos. Call 833‑607‑2973 • Sponsored AT&T Fiber is available in San Marcos. Get speeds up to 5 Gig. Check availability ↗ or call 833‑607‑2973 • Sponsored
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San Marcos has 16 internet options – View all▼
San Marcos has multiple fiber providers, including AT&T and Cox. Symmetric speeds of 5,000 Mbps are available in parts of San Marcos.
| Provider | DownDownload (Mbps) | UpUpload (Mbps) | AvailabilityCoverage |
|---|---|---|---|
| AT&T | 5,000 | 5,000 | 68% |
| Astound | 5,000 | 5,000 | 0.4% |
| Cox | 2,000 | 2,000 | 46% |
| Spectrum | 1,000 | 500 | 6% |
| Provider | DownDownload (Mbps) | UpUpload (Mbps) | AvailabilityCoverage |
|---|---|---|---|
| Cox | 2,000 | 500 | 98% |
| Spectrum | 1,000 | 1,000 | 57% |
| Provider | DownDownload (Mbps) | UpUpload (Mbps) | AvailabilityCoverage |
|---|---|---|---|
| AT&T | 100 | 20 | 97% |
| Provider | DownDownload (Mbps) | UpUpload (Mbps) | AvailabilityCoverage |
|---|---|---|---|
| GeoLinks | 1,000 | 1,000 | 6% |
| San Diego | 500 | 100 | 96% |
| Verizon | 300 | 20 | 100% |
| T-Mobile | 100 | 20 | 100% |
| MINTernet | 100 | 20 | 98% |
| AT&T | 100 | 20 | 70% |
| Provider | DownDownload (Mbps) | UpUpload (Mbps) | AvailabilityCoverage |
|---|---|---|---|
| Starlink | 280 | 30 | 100% |
| Provider | DownDownload (Mbps) | UpUpload (Mbps) | AvailabilityCoverage |
|---|---|---|---|
| Viasat | 150 | 3 | 100% |
| HughesNet | 50 | 5 | 100% |
Broadband Map's availability estimates are based on the census boundaries of San Marcos. Speed metrics capture internet providers' maximum advertised speeds. Both may be overoptimistic.
Broadband Map's listings of internet providers in San Marcos rely primarily on the May 2026 release from the FCC's Broadband Data Collection program (representing San Marcos ISPs' availability as of December 2025).