In St. Clair County there are 4 residential Fiber providers covering 38.78% of the county. The average home can get speeds up to 5,475 Mbps. Note that we may have a financial relationship with some of the providers below. This does not influence rankings, and helps us provide high-quality detailed information for free.
This page contains all Fiber internet providers in St. Clair County, IL.
To see availability maps for all providers including fiber, cable, DSL, and more in St. Clair County, IL please click below.
St. Clair County, IL Availability Maps
Fiber Internet Service Providers in St. Clair County
Data updated 11/14/2025, based on FCC data from 12/31/2024. This is the most current data available as of .
To avoid wasting your time, providers with less than 1% coverage in St. Clair County are not shown.
St. Clair County Satellite TV & Internet Providers
DISH Satellite TV
DIRECTV Satellite TV
Not sure whether to choose Dish or DIRECTV? For most people most of the time we recommend DISH. But click here to learn more.
Viasat Satellite Internet
Where in St. Clair County is fiber internet available?
Fiber Internet Availability Key
Fiber is available in 38.78% of St. Clair County. Areas in green have fiber internet service, where areas in yellow or red may not. The most widely available provider is i3 Broadband. Call one of the companies with service in St. Clair County above to see who has service at your home.
How fast is fiber internet in St. Clair County?
The map below shows maximum fiber internet speeds by area in St. Clair County.
Fiber Internet Speed Key
The average St. Clair County home can get up to 5,475 Mbps on their fiber internet plan. The fastest fiber download speed in the county is 8,000 Mbps, which 17.37% of residents can get. Some homes and apartments do not have access to these speeds. On the slower end, for example, less than 1% of homes can only purchase plans up to 600 Mbps. See the internet provider details below for info about their speed and coverage in St. Clair County.
Fiber internet speeds tend to be faster in the east parts of St. Clair County, and slower in the southwest areas of the county.
Is fiber the fastest internet I can get in St. Clair County?
The fastest internet for you may vary based on where in St. Clair County you live. In general, cable competes most often with fiber in the county.
- Fiber is the fastest internet type for 38.70% of St. Clair County homes.
- Cable is fastest for 54.88% of the county.
- DSL is fastest for less than 1%.
- Fixed wireless is fastest for 4.11%.
- Satellite internet may be the only option for 1.59% of St. Clair County homes.
Fiber Providers in Depth
Below you'll find which TV and internet providers offer service in St. Clair County, along with details on where in St. Clair County and at what speeds.
EarthLink Fiber in St. Clair County, IL
EarthLink fiber coverage
About 18.85%, or 48,509 people, have EarthLink fiber internet available to them in the county. The company covers the central, north, south, east, northeast, northwest, west, and southeast St. Clair County area. EarthLink is one of the largest internet service providers internet service providers in the US, with internet service available in a small portion of St. Clair County.
EarthLink fiber download speeds
EarthLink is above average when comparing download speeds to all other internet providers in St. Clair County. Versus other fiber providers in the area, EarthLink fiber is above average. There are 2 different maximum speeds throughout St. Clair County. The fastest plan anyone in St. Clair County can order from EarthLink goes up to 5,000 Mbps, the slowest package only goes up to 1,000 Mbps, and the county-wide average maximum speed for St. Clair County customers is up to 3,100 Mbps.
Show all download speeds
- 52.5% up to 5,000.0 Mbps
- 47.5% up to 1,000.0 Mbps
EarthLink fiber upload speeds
In St. Clair County download speeds tend to be equal to than upload speeds for EarthLink fiber. Compared to other ISPs, EarthLink is above average where upload speeds are concerned, and above average compared to other St. Clair County fiber providers. EarthLink offers 2 different upload speeds across the county, so your internet plan's upload speed may vary by neighborhood . The fastest upload speed available to anyone from this ISP in St. Clair County is up to 5,000 Mbps. Some customers have slower plan choices, which only go up to 1,000 Mbps. On average, EarthLink customers can get speeds up to 3,100 Mbps.
Show all upload speeds
- 52.5% up to 5,000.0 Mbps
- 47.5% up to 1,000.0 Mbps
AT&T Fiber in St. Clair County, IL
AT&T fiber coverage
About 18.85%, or 48,509 people, have AT&T fiber internet available to them in the county. The company covers the central, north, south, east, northeast, northwest, west, and southeast St. Clair County area. AT&T is one of the largest internet service providers internet service providers in the US, with internet service available in a small portion of St. Clair County.
AT&T fiber download speeds
AT&T is above average when comparing download speeds to all other internet providers in St. Clair County. Versus other fiber providers in the area, AT&T fiber is above average. There are 2 different maximum speeds throughout St. Clair County. The fastest plan anyone in St. Clair County can order from AT&T goes up to 5,000 Mbps, the slowest package only goes up to 1,000 Mbps, and the county-wide average maximum speed for St. Clair County customers is up to 3,100 Mbps.
Show all download speeds
- 52.5% up to 5,000.0 Mbps
- 47.5% up to 1,000.0 Mbps
AT&T fiber upload speeds
In St. Clair County download speeds tend to be equal to than upload speeds for AT&T fiber. Compared to other ISPs, AT&T is above average where upload speeds are concerned, and above average compared to other St. Clair County fiber providers. AT&T offers 2 different upload speeds across the county, so your internet plan's upload speed may vary by neighborhood . The fastest upload speed available to anyone from this ISP in St. Clair County is up to 5,000 Mbps. Some customers have slower plan choices, which only go up to 1,000 Mbps. On average, AT&T customers can get speeds up to 3,100 Mbps.
Show all upload speeds
- 52.5% up to 5,000.0 Mbps
- 47.5% up to 1,000.0 Mbps
i3 Broadband Fiber in St. Clair County, IL
i3 Broadband fiber coverage
About 17.37%, or 44,718 people, have i3 Broadband fiber internet available to them in the county. The company covers the central, north, east, northeast, south, southeast, and northwest St. Clair County area. i3 Broadband is a large internet service provider internet service providers in the US, with internet service available in a small portion of St. Clair County.
i3 Broadband fiber download speeds
i3 Broadband is the fastest when comparing download speeds to all other internet providers in St. Clair County. Versus other fiber providers in the area, i3 Broadband fiber is the fastest. There are no different maximum speeds throughout St. Clair County. The fastest plan anyone in St. Clair County can order from i3 Broadband goes up to 8,000 Mbps, and all St. Clair County customers can get this speed.
Show all download speeds
- 100.0% up to 8,000.0 Mbps
i3 Broadband fiber upload speeds
In St. Clair County download speeds tend to be equal to than upload speeds for i3 Broadband fiber. Compared to other ISPs, i3 Broadband is the fastest where upload speeds are concerned, and the fastest compared to other St. Clair County fiber providers. i3 Broadband offers no different upload speeds across the county. The fastest upload speed available to anyone from this ISP in St. Clair County is up to 8,000 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 8,000.0 Mbps
Frontier Communications Fiber in St. Clair County, IL
Frontier fiber coverage
About 3.91%, or 10,074 people, have Frontier fiber internet available to them in the county. The company covers the southeast, west, and east St. Clair County area. Frontier is one of the largest internet service providers internet service providers in the US, with internet service available in a very small piece of St. Clair County.
Frontier Communications fiber download speeds
Frontier is above average when comparing download speeds to all other internet providers in St. Clair County. Versus other fiber providers in the area, Frontier fiber is above average. There are 2 different maximum speeds throughout St. Clair County. The fastest plan anyone in St. Clair County can order from Frontier goes up to 7,000 Mbps, the slowest package only goes up to 5,000 Mbps, and the county-wide average maximum speed for St. Clair County customers is up to 5,319 Mbps.
Show all download speeds
- 15.9% up to 7,000.0 Mbps
- 84.1% up to 5,000.0 Mbps
Frontier Communications fiber upload speeds
In St. Clair County download speeds tend to be equal to than upload speeds for Frontier fiber. Compared to other ISPs, Frontier is above average where upload speeds are concerned, and above average compared to other St. Clair County fiber providers. Frontier offers 2 different upload speeds across the county, so your internet plan's upload speed may vary by neighborhood . The fastest upload speed available to anyone from this ISP in St. Clair County is up to 7,000 Mbps. Some customers have slower plan choices, which only go up to 5,000 Mbps. On average, Frontier customers can get speeds up to 5,319 Mbps.
Show all upload speeds
- 15.9% up to 7,000.0 Mbps
- 84.1% up to 5,000.0 Mbps
St. Clair County Fiber by Area
This information is most helpful to those looking for homes or considering moving to St. Clair County or any of the areas nearby.
How does fiber internet in St. Clair County compare to the rest of Illinois?
Fiber internet speeds in St. Clair County are much faster versus the average speeds in Illinois: 0.00 Mbps in Illinois versus 5,475 Mbps in the county. The state has similar fiber availability compared to the county. Average fiber coverage in Illinois is 0.00% versus 38.78% in St. Clair County.
What zip codes have fiber internet?
Fiber internet coverage varies by zip code and neighborhood. Some examples in or around St. Clair County are shown below. You can enter any zip code here to see TV and internet providers by zip code.
What does fiber internet look like in other counties?
Below are counties nearby and with similar populations. This comparison can be useful if living somewhere with fast internet is important to you.
Nearby Counties
- St. Louis City, MO: more fiber coverage, slower speeds
- St. Louis County, MO: more fiber coverage, slower speeds
- Clinton County, IL: more fiber coverage, faster speeds
- Marion County, IL: less fiber coverage, slower speeds
- Franklin County, MO: less fiber coverage, slower speeds
- Gasconade County, MO: more fiber coverage, slower speeds
- Wayne County, IL: more fiber coverage, slower speeds
- Osage County, MO: less fiber coverage, slower speeds
- Edwards County, IL: more fiber coverage, faster speeds
- Wabash County, IL: less fiber coverage, slower speeds
Counties with Similar Populations
- Horry County, SC: more fiber coverage, slower speeds
- Richmond County, GA: more fiber coverage, slower speeds
- Richmond City, VA: more fiber coverage, slower speeds
- Racine County, WI: more fiber coverage, slower speeds
- Onslow County, NC: more fiber coverage, slower speeds
- Okaloosa County, FL: more fiber coverage, slower speeds
- Niagara County, NY: less fiber coverage, slower speeds
- New Hanover County, NC: more fiber coverage, slower speeds
- Muscogee County, GA: more fiber coverage, slower speeds
- Leon County, FL: more fiber coverage, slower speeds