ZIP code 78221 covers a large portion of San Antonio's South Side, including established residential areas around Harlandale and newer development around Mission del Lago. Current broadband data shows a strong wired market: AT&T fiber and Spectrum cable both have broad reported footprints, while smaller fiber and fixed-wireless networks create additional address-level choices.
The latest public FCC Broadband Data Collection information used in current ZIP-level analyses is based on December 31, 2025 reporting. Provider plans and availability tools can change after that dataset, so this page separates network evidence from address-level verification.
ZIP-level data shows market patterns. Your street address determines which provider can actually install service.
The important feature of 78221 is not simply the number of providers listed in a ZIP-code search. The local network mix shows a large wired footprint with meaningful fiber competition in some parts of the ZIP and additional wireless options where wired choices may differ.
A current FCC-derived ZIP analysis updated in September 2026 reports AT&T fiber at approximately 92.65% of 78221 locations. It also identifies smaller fiber footprints from Spectrum, Hotwire Communications and Centric Fiber. The figures are useful for identifying the market pattern, but they should not be treated as a guarantee that every address on a covered street can order the same service.
Spectrum's cable network is reported across approximately 92.09% of 78221 in the same FCC-derived analysis. Spectrum currently advertises residential tiers of 100 Mbps, 500 Mbps and 1 Gbps, with 2 Gbps available only in selected markets. Its network is fiber-powered but normally uses coaxial cable for the final connection to the premises.
These are the providers and technologies that matter most when researching a residential address in 78221. Smaller operators are included where current broadband data indicates a meaningful local footprint.
| Provider | Connection | 78221 evidence | Advertised capability | What to verify |
|---|---|---|---|---|
|
AT&T Fiber
Fiber optic
|
Fiber | Broad ZIP-level footprint; current FCC-derived analysis reports about 92.65%. | Up to 5 Gbps; equal upload/download on fiber tiers where available. | Exact address, available tier and installation eligibility. |
|
Spectrum
Cable / limited fiber category
|
Cable; limited fiber category | Approximately 92.09% cable coverage reported in current ZIP analysis. | 100 Mbps, 500 Mbps and 1 Gbps residential tiers; 2 Gbps only in selected markets. | Exact plan, upload capability and whether the address falls in a fiber-reported area. |
|
Hotwire Communications
Limited fiber
|
Fiber | Approximately 6.27% of 78221 in FCC-derived analysis; localized rather than ZIP-wide. | Up to 8 Gbps reported for covered locations. | Building/community eligibility and exact serviceable unit. |
|
Centric Fiber
Community fiber
|
Fiber | Approximately 5.53% reported; Centric primarily builds fiber into selected communities. | Up to 1 Gbps reported in the 78221 FCC-derived dataset. | Community and street-level availability. |
|
Astound Broadband
Very limited cable
|
Cable | Approximately 1.17% reported in current ZIP-level analysis. | Up to 1.5 Gbps in reported San Antonio service areas. | Address-level service; the 78221 footprint is small. |
|
T-Mobile Home Internet
5G fixed wireless
|
5G fixed wireless | Broad wireless footprint reported in FCC-derived data; service qualification remains address-specific. | Typical current plan range approximately 170–498 Mbps download, depending on plan/network conditions. | Service qualification, signal conditions and expected capacity at the address. |
|
Verizon 5G Home
5G fixed wireless
|
5G fixed wireless | Current ZIP analysis reports a large potential fixed-wireless footprint, but Verizon requires address verification. | Plan speeds vary by location; current 5G Home tiers include plans advertising up to 300 Mbps. | Address eligibility and the specific plan offered. |
|
Alamo Broadband
Local fixed wireless
|
Fixed wireless | Significant South Texas/South San Antonio footprint; current ZIP analysis reports service across a substantial portion of 78221. | Up to 1 Gbps on selected wireless deployments; actual capacity varies by location. | Line-of-sight/radio conditions, tower coverage and address survey. |
|
VTX1
Fixed wireless / fiber
|
Fixed wireless; fiber in selected areas | Current FCC-derived ZIP analysis reports a meaningful fixed-wireless footprint. | Up to approximately 400 Mbps in current 78221 provider listings; fiber availability is location-specific. | Exact service type, tower/network availability and plan offered. |
Provider names alone can make a ZIP look more competitive than it is. In 78221, the useful distinction is between broad networks such as AT&T and Spectrum, limited fiber/community deployments, and wireless networks whose qualification can change from one address to the next.
AT&T is the clearest large-scale fiber option identified in current 78221 broadband data. The current FCC-derived analysis reports fiber service at roughly 92.65% of locations in the ZIP. AT&T itself states that fiber is available in parts of San Antonio and advertises speeds up to 5 Gbps where available.
View AT&T optionsSpectrum is the major cable competitor to AT&T in 78221. Current FCC-derived analysis reports approximately 92.09% cable coverage. Spectrum's current residential lineup includes 100 Mbps, 500 Mbps and 1 Gbps tiers. The company's network is fiber-powered, but standard Spectrum service is connected to the home through coaxial cable.
View Spectrum optionsHotwire is not a ZIP-wide competitor, but current FCC-derived data identifies a 6.27% fiber footprint in 78221. The reported locations include very high-capacity fiber, with maximum speeds reaching 8 Gbps in the underlying data. This is the type of provider that should be checked by exact building or community rather than assumed from the ZIP code.
Centric Fiber appears in the current 78221 FCC-derived provider data with a smaller footprint of approximately 5.53%. Centric describes its residential model as community-based fiber infrastructure installed with participating developments. That makes its presence particularly relevant to newer planned housing but not evidence of broad ZIP-wide availability.
T-Mobile operates a home-internet service from its 5G cellular network. A T-Mobile store is located directly in ZIP 78221 at SW Military Drive and Pleasanton, and the company lists Home Internet availability checking at that location. Current plan disclosures describe typical download speeds of approximately 170–498 Mbps for the applicable 5G plan.
View T-Mobile optionsVerizon lists San Antonio among its 5G Home Internet markets. Current Verizon plan information advertises 5G Home tiers with speeds that vary by location, including plans with maximum download speeds up to 300 Mbps. The service is cellular rather than wired, so an address that qualifies for Verizon 5G Home should not be assumed to receive the same performance as another 78221 address.
View Verizon optionsAlamo Broadband is particularly relevant to southern and southeastern San Antonio because its network was built around fixed wireless coverage across South Texas. The company reports coverage expansion around the South Side and currently advertises selected wireless services up to gigabit speeds. Its own coverage page tells customers to check the specific address because radio coverage is not guaranteed everywhere within a shaded service area.
VTX1 serves San Antonio with wireless and selected fiber services and describes its network as covering homes, businesses and rural properties. Current FCC-derived ZIP analysis identifies VTX1 fixed-wireless service in a meaningful portion of 78221. The provider's San Antonio service area includes Bexar County, but the connection type and speed still need to be verified at the property.
A higher advertised speed is not automatically a better choice. Upload performance, latency, network technology, household usage and the actual plan offered at the address can matter just as much.
The ZIP's geography produces a wider technology mix than the headline AT&T-versus-Spectrum comparison suggests.
Fiber is the strongest high-capacity technology in the ZIP. AT&T has the largest reported fiber footprint, while Hotwire, Centric and a smaller Spectrum fiber category add localized alternatives.
Spectrum's cable network remains one of the two dominant wired footprints. Current data reports cable service across roughly 92% of the ZIP.
Alamo Broadband and VTX1 provide local fixed-wireless alternatives, while T-Mobile and Verizon use cellular networks for their home-internet products.
Starlink, Viasat and Hughesnet can serve addresses where terrestrial networks are unavailable or unsuitable. Satellite is generally most relevant at locations with fewer wired choices.
78221 is unusually useful as a case study because its broadband infrastructure follows the ZIP's South Side geography and housing pattern rather than behaving like a uniform urban service area.
The strongest pattern is a two-network wired market: AT&T fiber and Spectrum cable. That creates a meaningful choice for many 78221 addresses, particularly where both networks reach the same property.
The second pattern is localized competition. Hotwire, Centric Fiber and Astound appear in the data but occupy much smaller footprints. Their presence can be important at an individual address without making them ZIP-wide alternatives.
The third pattern is wireless redundancy. T-Mobile, Verizon, Alamo Broadband and VTX1 give some households additional choices beyond the main wired networks. Those services should be evaluated using the provider's address checker rather than a ZIP-level availability percentage.
The table below separates what current data supports from what still requires address-level confirmation.
| Local finding | Current evidence | What it means for a household |
|---|---|---|
| Fiber availability | AT&T fiber is reported across approximately 92.65% of 78221 in current FCC-derived analysis. | Fiber should be one of the first technologies checked at a 78221 address. |
| Cable availability | Spectrum cable is reported across approximately 92.09% of the ZIP. | Many homes can potentially compare a major fiber network against Spectrum cable. |
| Localized fiber competition | Hotwire is reported at 6.27% and Centric Fiber at 5.53%. | Some developments may have additional fiber choices not visible from the dominant-provider comparison. |
| Fixed wireless | Alamo Broadband and VTX1 have reported local footprints, in addition to national 5G providers. | Wireless can be a useful third or fourth option where wired service is limited. |
| South Side development | Mission del Lago is a major planned residential/commercial development in the southern portion of the ZIP. | Newer housing areas may have different ISP infrastructure from established neighborhoods elsewhere in 78221. |
| Address-level variation | The FCC's fixed broadband map reports service at individual broadband-serviceable locations. | A provider listed for 78221 is not proof that every home or apartment can order that provider. |
The following locations help explain why broadband availability can differ inside the ZIP. They are included because they correspond to documented residential, community or geographic patterns rather than as a generic neighborhood list.
Mission del Lago is a large planned development south of Loop 410 along US 281, adjacent to Mitchell Lake and the Mission del Lago Golf Course. City planning documents describe a development footprint of hundreds of acres with thousands of residential units and commercial space. Newer housing in this area makes community-level fiber and address-specific infrastructure particularly relevant.
The Harlandale portion of 78221 contains established residential streets and city facilities such as Harlandale Park and Harlandale Community Center. Its older housing and utility patterns differ from newer master-planned construction farther south, so ZIP-wide provider percentages should not be treated as block-level coverage.
Mitchell Lake Audubon Center is located at 10750 Pleasanton Road in 78221. The area around Mitchell Lake includes open land and conservation-oriented uses alongside residential development, illustrating why a large ZIP can contain substantially different broadband service environments.
US 281 is a major north-south route through the southern portion of the ZIP and is central to Mission del Lago's development pattern. Broadband infrastructure serving newer residential construction along this corridor can differ from older neighborhoods closer to Loop 410.
Established residential sections of 78221 can have a combination of legacy AT&T infrastructure, Spectrum cable and newer fiber construction. This is one reason an address check should identify the actual connection type rather than simply displaying a provider name.
New subdivisions can have provider arrangements established during development. A home built recently may therefore have a different fiber or fixed-wireless option set from an older home only a short distance away.
Adjacent ZIPs can be useful when comparing service around the edges of 78221, but nearby ZIP coverage should not be assumed to cross the boundary uniformly.
Use ZIP-level research to identify realistic candidates, then verify the exact property before treating any provider, technology or speed as available.
Enter the complete address into the provider's availability checker. Apartment buildings, subdivisions and nearby streets can have different service records.
Confirm whether the offer is fiber, cable, fixed wireless, 5G or satellite. A provider's brand name alone does not tell you which network will serve the home.
Compare download speed, upload speed, price after introductory periods, equipment charges, data policies, contract requirements and installation terms.
Two addresses in the same ZIP can have different provider choices. The most useful comparison is therefore based on the plans actually offered at the property.
Upload capacity matters for remote work, large file transfers, cloud backups, security cameras and frequent video conferencing. Fiber's symmetrical plans can differ substantially from cable's traditional upload profile.
Fiber, cable, fixed wireless and 5G home internet have different technical characteristics. Do not compare only the headline download number.
Current provider promotions can be temporary. Compare the regular monthly rate and the promotional period rather than using the first advertised price as the long-term cost.
Check whether the modem, gateway, router or Wi-Fi service is included. Equipment policies can materially change the effective monthly cost.
5G and fixed-wireless service can vary with tower capacity, signal conditions, congestion and the position of the home. A strong ZIP-level coverage percentage does not guarantee identical performance everywhere.
Fiber and cable installations may involve different property access, wiring and construction requirements. Ask what is required before scheduling installation, especially in newer developments or apartment properties.
ZIP-level broadband data can narrow the field, but the exact address is the final test. Start with the providers that match your property's available network types.
This page combines current provider information with broadband availability data. Provider marketing pages describe the plans and network capabilities they currently advertise; FCC-derived datasets are used to identify local network footprints. The two types of evidence are not interchangeable.
Answers below focus on the broadband characteristics that are most relevant to ZIP code 78221.
The major wired providers are AT&T and Spectrum. Current FCC-derived ZIP analysis also identifies smaller fiber footprints from Hotwire Communications and Centric Fiber, a very small Astound footprint, and fixed-wireless providers including Alamo Broadband and VTX1. T-Mobile Home Internet and Verizon 5G Home provide additional wireless alternatives where the address qualifies.
Yes. AT&T Fiber has a large reported footprint in 78221, while smaller fiber footprints are reported for Hotwire Communications, Centric Fiber and Spectrum. Current AT&T residential fiber plans reach up to 5 Gbps where available. A provider's ZIP-level presence does not mean every address can order fiber.
Spectrum's cable network is reported across approximately 92.09% of the ZIP in current FCC-derived analysis. Spectrum currently advertises 100 Mbps, 500 Mbps and 1 Gbps residential tiers. Exact upload speeds and plan availability should be checked by address.
T-Mobile Home Internet and Verizon 5G Home are both present in the San Antonio market and have service footprints that include portions of 78221. Both require address-level qualification because cellular capacity and service eligibility can vary by location.
AT&T advertises fiber speeds up to 5 Gbps where available. Current FCC-derived ZIP data also reports limited Hotwire Communications fiber locations with speeds up to 8 Gbps. These maximum figures apply only to locations where the corresponding network and plan are actually available.
Yes. Alamo Broadband is a South Texas fixed-wireless provider with a network footprint extending across the southern San Antonio region. Current FCC-derived analysis identifies a substantial 78221 footprint. Because fixed wireless depends on location, radio conditions and network reach, the provider's address-level coverage tool should be used before treating it as an option.
ZIP 78221 covers a large geographic area containing older residential neighborhoods, open land and newer planned development such as Mission del Lago. Broadband networks are built by address and development, so a provider can have substantial ZIP-wide coverage without serving every street, apartment building or new subdivision.
Yes. The FCC National Broadband Map is useful because its fixed-broadband data is reported at individual locations. It can show the providers, technology and maximum advertised speeds reported for a specific address. Provider availability tools should also be checked because they determine whether the provider currently accepts an order for that property.