In St. Clair County there are 7 residential Fiber providers covering 23.45% of the county. The average home can get speeds up to 3,349 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, MI.
To see availability maps for all providers including fiber, cable, DSL, and more in St. Clair County, MI please click below.
St. Clair County, MI 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 23.45% 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 AT&T. 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 3,349 Mbps on their fiber internet plan. The fastest fiber download speed in the county is 5,000 Mbps, which 13.72% of residents can get. Some homes and apartments do not have access to these speeds. On the slower end, for example, 8.83% of homes can only purchase plans up to 1,000 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 northeast parts of St. Clair County, and slower in the southeast 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 18.54% of St. Clair County homes.
- Cable is fastest for 72.28% of the county.
- DSL is fastest for less than 1%.
- Fixed wireless is fastest for 8.22%.
- Satellite internet may be the only option for less than 1% 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, MI
EarthLink fiber coverage
About 9.14%, or 14,663 people, have EarthLink fiber internet available to them in the county. The company covers the east, northeast, north, central, and southwest 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 very small piece 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 4,972 Mbps.
Show all download speeds
- 99.3% up to 5,000.0 Mbps
- 0.7% 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 4,972 Mbps.
Show all upload speeds
- 99.3% up to 5,000.0 Mbps
- 0.7% up to 1,000.0 Mbps
AT&T Fiber in St. Clair County, MI
AT&T fiber coverage
About 9.14%, or 14,663 people, have AT&T fiber internet available to them in the county. The company covers the east, northeast, north, central, and southwest 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 very small piece 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 4,972 Mbps.
Show all download speeds
- 99.3% up to 5,000.0 Mbps
- 0.7% 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 4,972 Mbps.
Show all upload speeds
- 99.3% up to 5,000.0 Mbps
- 0.7% up to 1,000.0 Mbps
XFINITY from Comcast Fiber in St. Clair County, MI
XFINITY fiber coverage
About 7.22%, or 11,583 people, have XFINITY fiber internet available to them in the county. The company covers the northwest, south, west, central, southwest, and north St. Clair County area. XFINITY 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.
XFINITY from Comcast fiber download speeds
XFINITY is below average when comparing download speeds to all other internet providers in St. Clair County. Versus other fiber providers in the area, XFINITY fiber is below average. There are 3 different maximum speeds throughout St. Clair County. The fastest plan anyone in St. Clair County can order from XFINITY goes up to 2,000 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 1,037 Mbps.
Show all download speeds
- 0.4% up to 2,000.0 Mbps
- 16.4% up to 1,200.0 Mbps
- 83.2% up to 1,000.0 Mbps
XFINITY from Comcast fiber upload speeds
In St. Clair County download speeds tend to be faster than than upload speeds for XFINITY fiber. Compared to other ISPs, XFINITY is below average where upload speeds are concerned, and below average compared to other St. Clair County fiber providers. XFINITY offers 3 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 1,000 Mbps. Some customers have slower plan choices, which only go up to 35 Mbps. On average, XFINITY customers can get speeds up to 887 Mbps.
Show all upload speeds
- 88.1% up to 1,000.0 Mbps
- 0.4% up to 250.0 Mbps
- 11.4% up to 35.0 Mbps
Duke Broadband Fiber in St. Clair County, MI
Duke Broadband fiber coverage
About 4.44%, or 7,126 people, have Duke Broadband fiber internet available to them in the county. The company covers the south, southeast, central, southwest, and east St. Clair County area. Duke Broadband is a small internet service provider internet service providers in the US, with internet service available in a very small piece of St. Clair County.
Duke Broadband fiber download speeds
Duke Broadband is below average when comparing download speeds to all other internet providers in St. Clair County. Versus other fiber providers in the area, Duke Broadband fiber is one of the slowest. There are no different maximum speeds throughout St. Clair County. The fastest plan anyone in St. Clair County can order from Duke Broadband goes up to 1,000 Mbps, and all St. Clair County customers can get this speed.
Show all download speeds
- 100.0% up to 1,000.0 Mbps
Duke Broadband fiber upload speeds
In St. Clair County download speeds tend to be faster than than upload speeds for Duke Broadband fiber. Compared to other ISPs, Duke Broadband is below average where upload speeds are concerned, and the slowest compared to other St. Clair County fiber providers. Duke 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 100 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 100.0 Mbps
Mercury Broadband Fiber in St. Clair County, MI
Mercury Broadband fiber coverage
About 3.43%, or 5,502 people, have Mercury Broadband fiber internet available to them in the county. The company covers the northwest, north, and west St. Clair County area. Mercury Broadband is a large internet service provider internet service providers in the US, with internet service available in a very small piece of St. Clair County.
Mercury Broadband fiber download speeds
Mercury Broadband is one of the fastest when comparing download speeds to all other internet providers in St. Clair County. Versus other fiber providers in the area, Mercury Broadband fiber is one of the fastest. There are no different maximum speeds throughout St. Clair County. The fastest plan anyone in St. Clair County can order from Mercury Broadband goes up to 5,000 Mbps, and all St. Clair County customers can get this speed.
Show all download speeds
- 100.0% up to 5,000.0 Mbps
Mercury Broadband fiber upload speeds
In St. Clair County download speeds tend to be equal to than upload speeds for Mercury Broadband fiber. Compared to other ISPs, Mercury Broadband is one of the fastest where upload speeds are concerned, and one of the fastest compared to other St. Clair County fiber providers. Mercury 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 5,000 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 5,000.0 Mbps
Highline Fiber in St. Clair County, MI
Highline fiber coverage
About 1.69%, or 2,713 people, have Highline fiber internet available to them in the county. The company covers the northwest and north St. Clair County area. Highline is a large internet service provider internet service providers in the US, with internet service available in a very small piece of St. Clair County.
Highline fiber download speeds
Highline is below average when comparing download speeds to all other internet providers in St. Clair County. Versus other fiber providers in the area, Highline fiber is one of the slowest. There are no different maximum speeds throughout St. Clair County. The fastest plan anyone in St. Clair County can order from Highline goes up to 1,000 Mbps, and all St. Clair County customers can get this speed.
Show all download speeds
- 100.0% up to 1,000.0 Mbps
Highline fiber upload speeds
In St. Clair County download speeds tend to be equal to than upload speeds for Highline fiber. Compared to other ISPs, Highline is below average where upload speeds are concerned, and below average compared to other St. Clair County fiber providers. Highline 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 1,000 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 1,000.0 Mbps
Frontier Communications Fiber in St. Clair County, MI
Frontier fiber coverage
About 1.21%, or 1,942 people, have Frontier fiber internet available to them in the county. The company covers the northwest 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 one of the fastest when comparing download speeds to all other internet providers in St. Clair County. Versus other fiber providers in the area, Frontier fiber is one of the fastest. There are no different maximum speeds throughout St. Clair County. The fastest plan anyone in St. Clair County can order from Frontier goes up to 5,000 Mbps, and all St. Clair County customers can get this speed.
Show all download speeds
- 100.0% 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 one of the fastest where upload speeds are concerned, and one of the fastest compared to other St. Clair County fiber providers. Frontier 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 5,000 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% 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 Michigan?
Fiber internet speeds in St. Clair County are much faster versus the average speeds in Michigan: 0.00 Mbps in Michigan versus 3,349 Mbps in the county. The state has similar fiber availability compared to the county. Average fiber coverage in Michigan is 0.00% versus 23.45% 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
- Lapeer County, MI: less fiber coverage, faster speeds
- Genesee County, MI: less fiber coverage, faster speeds
- Shiawassee County, MI: more fiber coverage, faster speeds
- Clinton County, MI: more fiber coverage, faster speeds
- Ionia County, MI: more fiber coverage, slower speeds
- Kent County, MI: more fiber coverage, faster speeds
- Ottawa County, MI: more fiber coverage, faster speeds
- Erie County, NY: more fiber coverage, slower speeds
- Genesee County, NY: more fiber coverage, slower speeds
- Ontario County, NY: more fiber coverage, faster speeds
Counties with Similar Populations
- Charles County, MD: more fiber coverage, slower speeds
- Paulding County, GA: more fiber coverage, faster speeds
- Davidson County, NC: more fiber coverage, faster speeds
- Pueblo County, CO: more fiber coverage, slower speeds
- Chittenden County, VT: more fiber coverage, slower speeds
- Beaver County, PA: more fiber coverage, slower speeds
- Merrimack County, NH: more fiber coverage, slower speeds
- Mesa County, CO: more fiber coverage, slower speeds
- Middlesex County, CT: more fiber coverage, faster speeds
- Midland County, TX: more fiber coverage, faster speeds