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AT&T vs Xfinity in Charleston
Charleston’s trade-off is AT&T’s faster fiber uploads where available versus Xfinity’s broader city reach and lower availability risk.
Xfinity is the better overall pick in Charleston because it reaches about 91% of the city, costs $40/mo to start, and offers a more consistently available connection, while AT&T starts at $35/mo. AT&T wins on speed where it reaches your address, with up to 5,000/5,000 Mbps; Xfinity wins on coverage, and AT&T wins on starting price. Choose AT&T if its fiber service is available and you need strong uploads; choose Xfinity for broader availability and a simpler all-around choice. Their speed scores are close: 97 for AT&T and 96 for Xfinity.
At a glance
AT&T vs. Xfinity, side by side.
| Provider | Type | Top speed | City coverage | Starting price | Best for |
|---|---|---|---|---|---|
| AT&T |
Fiber | 5 Gig 5 Gig upload |
86% | $35/mo | Top fiber speeds |
| Xfinity |
Cable | 2 Gig 300 Mbps upload |
91% | $40/mo | Widest availability |
Coverage map
Two different questions, two views. Top speed shows who offers the faster plan where you can actually get it. Coverage shows who reaches more of each ZIP. Or pick a single provider to see just its footprint.
Neighborhood breakdown
The choice can shift by block because coverage varies across Charleston. AT&T reaches about 86% of the city across its technologies, while Xfinity reaches about 91%; check your exact address before choosing, especially if you want AT&T fiber.
| ZIP | Neighborhoods | Coverage | Top speed | Rank score | Winner | |||
|---|---|---|---|---|---|---|---|---|
| AT&T | Xfinity | AT&T | Xfinity | AT&T | Xfinity | |||
| 29407 | West Ashley, South Windermere, Avondale, Byrnes Downs | 24% | 100% | 5 Gig | 2 Gig | 23 | 85 | Xfinity |
| 29412 | James Island, Riverland Terrace, Fort Johnson, Stiles Point | 71% | 98% | 5 Gig | 2 Gig | 69 | 83 | Xfinity |
| 29414 | West Ashley, Shadowmoss, Grand Oaks, Carolina Bay | 50% | 96% | 5 Gig | 2 Gig | 49 | 81 | Xfinity |
| 29406 | North Charleston, Deer Park, Charleston Farms | 15% | 99% | 5 Gig | 2 Gig | 15 | 84 | Xfinity |
| 29403 | Hampton Park Terrace, North Central, Wagener Terrace, Cannonborough-Elliotborough | 32% | 98% | 5 Gig | 2 Gig | 31 | 83 | Xfinity |
| 29492 | Daniel Island, Cainhoy, Clements Ferry Road | 65% | 38% | 5 Gig | 2 Gig | 63 | 32 | AT&T |
| 29401 | South of Broad, French Quarter, Harleston Village, Ansonborough | 18% | 100% | 5 Gig | 2 Gig | 17 | 85 | Xfinity |
| 29417 | West Ashley (PO Box) | 42% | 100% | 5 Gig | 2 Gig | 41 | 85 | Xfinity |
| 29416 | West Ashley (PO Box) | 12% | 100% | 5 Gig | 2 Gig | 11 | 85 | Xfinity |
| 29422 | James Island (PO Box) | 34% | 98% | 5 Gig | 2 Gig | 33 | 83 | Xfinity |
| 29424 | College of Charleston | 3% | 100% | 5 Gig | 2 Gig | 3 | 85 | Xfinity |
| 29413 | Charleston (general delivery / PO Box) | 23% | 100% | 5 Gig | 2 Gig | 22 | 85 | Xfinity |
Rank score (0–100) is each provider’s Speed Score, discounted for weak upload, times the share of that ZIP it reaches — the same rule that orders providers on the Charleston city page, so it moves as availability changes street to street.
Which is better for…
The right pick comes down to what you actually do online.
Get connected
Pick your provider and check availability at your address.
- 5 Gig down · 5 Gig up Fiber
- 1 Gig down · 1 Gig up Fiber
- 100 Mbps down · 20 Mbps up Copper
- 2 Gig down · 300 Mbps up Cable
- 1 Gig down · 35 Mbps up Cable
See what’s actually available at your address
Coverage changes from one street to the next. Check your exact address in seconds.
Check my addressFrequently asked questions
Does AT&T fiber reach my Charleston address?
AT&T fiber reaches about 36% of Charleston. AT&T reaches about 86% of the city across all its technologies, but that does not mean fiber is available at every address; check your exact address before signing up.
Which is cheaper in Charleston, AT&T or Xfinity, and what will I actually pay?
AT&T starts at $35/mo, while Xfinity starts at $40/mo. These are promotional starting rates, so confirm the post-promo rate, equipment fees, and any contract before signing; check the final offer for your address.
Which is faster for gaming, working from home, or 4K streaming?
AT&T offers up to 5,000/5,000 Mbps where available, versus Xfinity’s up to 2,000/300 Mbps. AT&T is the faster option for uploads and demanding households if it reaches your address, while Xfinity’s broader availability may matter more; check availability and the offered tier before ordering.
More Charleston comparisons
How Charleston’s other qualifying providers stack up head-to-head.