San Francisco • ZIP 94109

94109 Internet Providers

Internet service in 94109 is unusually diverse for a compact, high-density San Francisco ZIP code. Xfinity has the broadest cable footprint, while Sonic, Astound and AT&T provide fiber in portions of the ZIP. Building-level availability matters because much of 94109 consists of older, multi-unit residential properties.

Fiber availability is address-specific Xfinity cable reaches most of the ZIP 5G availability depends on location and capacity

Check service for your address

ZIP-level research identifies providers that report service in 94109. Your building and unit determine the services you can actually order.

A ZIP code is not a service guarantee. FCC broadband data is reported at individual locations, and providers may require an exact service address before confirming eligibility.

99.4%

Estimated Xfinity cable coverage in 94109

25.6%

Estimated Sonic fiber availability

23.8%

Estimated Astound fiber availability

61.1%

Housing units in 20+ unit structures

94109 Broadband Overview

What the local data shows

94109 covers a dense section of central San Francisco, including portions of Polk, Russian Hill, Nob Hill, Downtown/Civic Center and the surrounding residential areas. Its broadband market is shaped as much by building infrastructure as by the networks running along neighborhood streets.

Several fixed-network technologies compete in the ZIP

FCC-derived ZIP-level data identifies cable, fiber, DSL and fixed-wireless services in 94109. Xfinity's cable network is reported across approximately 99.4% of the ZIP. Fiber is more fragmented: Sonic is reported at about 25.6%, Astound fiber at about 23.8%, and AT&T fiber at about 8.9%.

Those percentages should not be added together. Networks overlap, and the same building can have several providers while another nearby building may have fewer. The useful distinction for 94109 residents is that fiber is present at a meaningful but incomplete share of locations rather than being uniformly available throughout the ZIP.

Local finding: 94109 is not simply a cable-versus-5G market. Multiple fiber networks have measurable ZIP-level footprints, but their coverage is substantially narrower than the dominant cable network.

Why the ZIP is different

Most housing is in multi-unit buildings rather than detached homes.
Older buildings can have different internal wiring, risers and equipment-room arrangements.
Provider availability can change from one building to the next on the same block.
Some local providers specifically evaluate the building before installation.
A fiber network being present in the ZIP does not establish service to every apartment.

Provider Comparison

Internet providers reported in 94109

The table separates broad ZIP-level networks from providers whose service is more dependent on a particular building, wireless capacity or address.

Provider	Connection	94109 evidence	Advertised capability	What to verify
Xfinity Broad ZIP footprint	Cable	About 99.4% ZIP-level availability in FCC-derived data	Up to 2 Gbps reported across the ZIP	Exact building, plan tier, upload speed and current pricing
Sonic Fiber footprint	Fiber	About 25.6% ZIP-level availability	Up to 10 Gbps symmetric	Exact street address and building connection
Astound Broadband Mixed footprint	Fiber / Cable	About 27.6% combined; approximately 23.8% fiber and 8.7% cable in FCC-derived data	Up to 1.5 Gbps reported	Technology available at the specific address
AT&T Mixed network	Fiber / DSL / fixed wireless	Fiber reported at about 8.9%; legacy DSL reaches substantially more locations	Fiber plans up to 5 Gbps where available	Do not assume an AT&T address result means fiber
Monkeybrains Building-dependent	Local wireless / fiber-connected networks	Documented service at multiple 94109 apartment buildings	Residential service advertised up to 1 Gbps; larger buildings may qualify for higher speeds	Building eligibility and installation requirements
Webpass Building-dependent	Fixed wireless / building network	FCC-derived San Francisco data reports Webpass fixed-wireless availability; 94109 network addresses are also associated with Webpass	Up to 1 Gbps reported in San Francisco datasets	Whether the particular apartment building is connected
T-Mobile Home Internet Wireless	5G fixed wireless	Reported as an available fixed-wireless option in San Francisco	Speeds vary substantially by location and network capacity	Exact address eligibility and expected capacity
Verizon 5G Home Wireless	5G fixed wireless	Reported as available across San Francisco	Up to 1 Gbps in current FCC-derived city data	Address eligibility, signal and capacity

Local Provider Details

What each major option means in 94109

The practical difference between providers in 94109 is not simply maximum download speed. Network type, building access, upload performance and the physical location of the service equipment can change the available choices.

Cable

Xfinity

Widely reported

Xfinity is the dominant fixed cable network in the ZIP. FCC-derived ZIP data puts its cable availability at roughly 99.4%, making it the most consistent baseline provider across 94109 addresses.

~99.4% ZIP-level cable availability

2 Gbps Maximum reported download

Xfinity's broad footprint does not mean every building receives the same plan configuration. Upload speeds and available tiers can differ by location.

ZIP evidence: FCC-derived 94109 availability data.

Fiber

Sonic

Partial ZIP footprint

Sonic has a significant fiber presence in 94109 but does not cover the ZIP uniformly. FCC-derived ZIP analysis reports fiber availability at approximately 25.6%.

~25.6% Reported fiber availability

10 Gbps Symmetric maximum reported

Recent 94109 property listings also document Sonic fiber alongside other providers at individual buildings, illustrating why a street-level or neighborhood-level assumption is not enough to establish eligibility.

ZIP evidence: FCC-derived provider data plus current 94109 building-level availability examples.

Fiber / Cable

Astound Broadband

Partial ZIP footprint

Astound has a smaller but important footprint in 94109. FCC-derived data reports approximately 27.6% combined availability, with fiber accounting for about 23.8% and cable about 8.7%.

~23.8% Reported fiber availability

1.5 Gbps Maximum reported

Because Astound's Bay Area service includes different network types and its own availability checker requires an exact address, residents should verify whether the result is fiber or cable rather than treating the provider name as a technology guarantee.

ZIP evidence: FCC-derived 94109 provider data; provider availability requires an address.

Fiber / DSL / Wireless

AT&T

Technology varies

AT&T requires particular care in 94109 because the company has more than one fixed-network technology in the ZIP. FCC-derived data reports fiber at about 8.9%, while legacy DSL is reported much more broadly.

~8.9% Reported fiber availability

Up to 5 Gbps Fiber maximum where available

An AT&T service result should therefore be checked for the actual technology. A DSL or fixed-wireless result should not be described as AT&T Fiber.

ZIP evidence: FCC-derived 94109 data and AT&T's current fiber coverage map.

Local Provider

Monkeybrains

Building-specific

Monkeybrains is particularly relevant to dense 94109 apartment areas. Its residential service page requires an address check and states that building eligibility is reviewed before installation.

$35/mo Current advertised base residential rate

Up to 1 Gbps Standard residential maximum advertised

Current 94109 rental listings document Monkeybrains service at multiple buildings, including properties on California Street, Pine Street, Sacramento Street, Sutter Street and other central 94109 blocks.

Local evidence: Monkeybrains residential availability requirements plus current 94109 property listings.

Fixed Wireless

Webpass

Building-specific

Webpass is a different kind of option from a conventional cable or neighborhood-wide fiber network. Service is commonly dependent on whether an individual multi-unit building is connected.

Up to 1 Gbps Reported San Francisco capability

Building-dependent Availability can change by property

FCC-derived San Francisco data includes Webpass as a fixed-wireless provider, while network records associate Webpass addresses with 94109. This makes it a relevant building-level option, not a ZIP-wide guarantee.

Evidence: FCC-derived San Francisco provider data and network-address records associated with 94109.

94109 Availability Analysis

Why availability can change from one building to the next

94109 has one of the clearest examples of why ZIP-level broadband statistics should be treated as a starting point, not an ordering result.

Large share of multi-unit housing

Census-derived 2020–2024 data indicates that about 61.1% of 94109 housing units are in structures containing 20 or more units, while only about 3.7% are in single-unit structures. That changes the practical meaning of broadband availability because the network must reach the building and its internal distribution system.

Older building stock matters

The ZIP's housing stock has a median construction year around 1938. Older apartment buildings can have different riser layouts, utility pathways and equipment locations from newer construction. A provider can therefore have infrastructure on the surrounding street without offering the same installation path inside every property.

Renters dominate the housing market

Approximately 81.9% of occupied housing units in Census-derived 2019–2023 data are renter-occupied. For many residents, broadband decisions therefore intersect with building management, existing wiring, installation permissions and the provider choices already present in the property.

39,043 Housing units in 94109 in 2019–2023 ACS-derived data

81.9% Occupied units that are renter-occupied

61.1% Units in structures with 20 or more units

1938 Approximate median structure year

What this means for residents: In 94109, checking the exact apartment or condo building is especially important. The ZIP contains enough competing networks that a building may have fiber, cable and a local fixed-wireless option simultaneously, while another building nearby may have a substantially different set of choices.

Neighborhood-Level Context

94109 is not one uniform broadband market

ZIP 94109 spans several distinct central San Francisco neighborhoods. Provider networks do not necessarily follow those neighborhood boundaries, but the housing and building patterns help explain why availability can vary substantially.

Nob Hill

Nob Hill contains a large concentration of apartment and condominium buildings. Current 94109 property records document local-provider availability at individual buildings, including Monkeybrains service. Fiber eligibility should still be confirmed by exact address rather than inferred from nearby buildings.

Russian Hill

Russian Hill combines older low-rise and multi-unit properties with larger residential buildings. That mix makes building access and internal infrastructure important when comparing Sonic, Astound, AT&T, Xfinity and local providers.

Polk Gulch

Polk Gulch has a particularly dense apartment environment. Current 2026 property listings in the area show buildings with Monkeybrains service, while other listings document combinations such as Comcast, Monkeybrains and Sonic. These examples demonstrate building-level competition rather than ZIP-wide uniformity.

Civic Center / Downtown edge

The southern portion of the broader 94109 area transitions toward Civic Center and Downtown. Local housing and redevelopment patterns differ from the hill neighborhoods, and provider footprints can change accordingly.

Tenderloin edge

The 94109 boundary includes portions associated with the Tenderloin and surrounding central neighborhoods. Dense multi-unit housing means that building-level service agreements, wiring and installation access can be more important than a simple citywide coverage statement.

Van Ness corridor

Larger residential properties along and near Van Ness can have different provider arrangements from smaller apartment buildings on surrounding residential streets. Address-level checks are particularly useful when comparing fiber with cable and building-oriented wireless services.

Connection Types

Fiber, cable and wireless options in 94109

The connection type available at a specific building affects upload performance, network architecture, installation and sometimes the range of plan choices.

Fiber

Sonic, Astound and AT&T all have measurable fiber availability in 94109. Fiber is present across multiple parts of the ZIP but is not universal. Sonic has the largest reported fiber footprint among the major named residential fiber providers in the ZIP-level dataset.

Cable

Xfinity is the dominant cable provider and reaches roughly 99.4% of 94109 in FCC-derived ZIP data. Astound also has a smaller cable footprint. Cable availability is therefore substantially broader than fiber availability in the ZIP.

Fixed Wireless

Monkeybrains and Webpass provide local fixed-wireless or building-oriented alternatives, while T-Mobile and Verizon offer 5G home internet where the address qualifies. Wireless results depend more directly on building location, signal conditions and network capacity.

DSL

AT&T and EarthLink are reported with DSL availability in ZIP-level datasets. This is a legacy option and should not be confused with AT&T Fiber. The presence of a provider's DSL network does not establish that faster fiber service is available at the same address.

Speed Guide

How much internet speed makes sense in a 94109 apartment?

Maximum advertised speed is not the same thing as actual household performance. Upload capacity, Wi-Fi layout, simultaneous use and the quality of the building connection can matter just as much.

100–300 Mbps

Often sufficient for a smaller household with ordinary browsing, video calls, streaming and a limited number of simultaneous devices. This range can also make sense when a building offers few higher-speed alternatives.

500 Mbps–1 Gbps

Provides more headroom for multiple residents, frequent large downloads, high-resolution streaming, gaming and work-from-home use. In 94109, this tier can be available through cable, fiber or building-oriented networks, depending on the property.

2–10 Gbps

These tiers exist in parts of the ZIP through providers such as Xfinity, AT&T, Astound and Sonic. They are not necessary for most households and should only be considered when the actual address qualifies and the household has a reason to use the additional capacity.

A More Useful Way to Compare 94109 Service

Do not compare plans by download speed alone

The same advertised download tier can represent a very different connection depending on the technology and building.

Check upload speed

Cable and fiber can have very different upload profiles. For residents working from home, transferring large files, using cloud backups or regularly uploading video, the upload figure can be more informative than the headline download number.

Check the actual technology

AT&T is a good example in 94109: the company can appear in address-level data through fiber, DSL or fixed wireless. The provider name alone does not identify the connection type.

Check the building

A provider's ZIP-wide or citywide coverage does not prove that a specific apartment is serviceable. This is especially important in a ZIP where most housing is contained in multi-unit structures.

94109 FAQ

Questions about internet service in ZIP 94109

What is the most widely available internet connection in 94109?

Cable is the most broadly reported fixed connection. FCC-derived ZIP data places Xfinity cable availability at approximately 99.4% of 94109. This is a ZIP-level estimate, not a guarantee for every apartment.

Is fiber internet available in 94109?

Yes. Sonic, Astound and AT&T all have reported fiber availability in the ZIP. Current FCC-derived ZIP estimates put Sonic at about 25.6%, Astound fiber at about 23.8% and AT&T fiber at about 8.9%. These figures overlap and should not be added together.

Does AT&T availability in 94109 mean AT&T Fiber?

No. AT&T has multiple technologies in the ZIP. ZIP-level data reports a much broader AT&T DSL footprint than its fiber footprint. Residents should verify the technology returned for the exact address.

Can I get Sonic Fiber in every part of 94109?

No. Sonic has a substantial fiber presence in 94109, but the reported ZIP-level footprint is approximately 25.6%. A particular street or building must be checked directly.

Is Monkeybrains available in 94109?

Yes, building-level evidence shows Monkeybrains service at multiple 94109 properties. Its own residential service process requires an address check, and installation may require a building assessment.

Why can two nearby 94109 buildings have different providers?

Provider networks can overlap unevenly, and multi-unit buildings have their own internal wiring, equipment, installation paths and property-management considerations. This is especially relevant in 94109 because a large share of housing is in buildings with 20 or more units.

Are 5G home internet services available in 94109?

T-Mobile and Verizon are reported as fixed-wireless providers in San Francisco datasets. Actual home-internet eligibility depends on the service address, network capacity and wireless conditions at that location.

Should renters check with their landlord before ordering internet?

For conventional cable or existing fiber connections, the main issue is usually whether the building is already wired for the provider. Building-oriented providers can involve additional installation considerations, so renters should verify building requirements before scheduling a new installation.

Sources & Methodology

How this 94109 guide was researched

Provider availability changes over time and should be checked at the service address. This page separates current ZIP-level research from provider claims that require an address-level check.

FCC National Broadband Map / Broadband Data Collection Used as the primary framework for understanding fixed broadband availability and the difference between ZIP-level geography and individual service locations.

FCC-derived 94109 provider data Current third-party datasets based on FCC Broadband Data Collection records were used for ZIP-level provider, technology and availability estimates.

AT&T Fiber Coverage Map Used to verify that AT&T treats fiber coverage as approximate and address-dependent rather than universally available by ZIP.

Astound Broadband service checker Used to confirm that Astound requires an exact service address because availability varies by location.

Monkeybrains Residential Service Information Used for current residential pricing, installation information, address eligibility and building-assessment requirements.

San Francisco city housing and neighborhood data Used to identify the ZIP's housing context and the neighborhoods associated with 94109.

Current 94109 property listings Used only as building-level evidence of provider presence. Property listings are not treated as proof of ZIP-wide coverage.

Research date: September 28, 2026 Availability and plan information can change after publication. Address-level provider tools should be treated as the final eligibility check.

Methodology note: Coverage percentages in this guide are estimates derived from broadband availability datasets and are presented to describe the shape of the 94109 market, not to promise service at a particular address. FCC broadband availability is reported using location-level records. Provider coverage estimates can also change as providers update their Broadband Data Collection filings. Where a provider offers more than one technology, the technology is identified separately whenever the available data permits.

The 94109 housing analysis is included because building characteristics materially affect broadband choice in this ZIP. A large share of units are in multi-unit structures, and the ZIP includes older residential buildings as well as newer development. Those conditions make building-level availability more useful than simply listing every provider that operates somewhere in San Francisco.

Check the exact 94109 address before choosing a plan

ZIP-level data can show which networks operate in 94109, but the final answer depends on the building and service address.

Check Your Address