12 Best Internet Providers in St. Clair County, IL
Find internet availability by address in St. Clair County, IL
Jump to: Best Internet Provider | Availability Maps | Customer Reviews | St. Clair County ISP Report Card | Business Internet in St. Clair County
 |
St. Clair County ISP Report Card | B- |
 |
Download Speed for Most Households | 2,726 Mbps |
 |
Number of Internet Service Providers | 12 |
 |
Real St. Clair County Customer Ratings | 7 |
This page reflects the most recent FCC update from January 06, 2026, based on the Broadband Data Collection as of June 30, 2025.
This page reflects the most recent FCC update from January 06, 2026, based on the Broadband Data Collection as of June 30, 2025.
St. Clair County has 12 internet service providers, they are sorted by coverage, available speed, and customer rating from our unbiased internet provider report. Fiber, Cable, DSL, and Fixed Wireless internet are available in the county. Reviews are grouped by provider and the type of service they offer, covering all 4 available internet technologies in St. Clair County.
▼
St. Clair County has 12 internet service providers, they are sorted by coverage, available speed, and customer rating from our unbiased internet provider report. Fiber, Cable, DSL, and Fixed Wireless internet are available in the county. Reviews are grouped by provider and the type of service they offer, covering all 4 available internet technologies in St. Clair County.
Compare Providers Ranked by Coverage, Speed, and Customer Ratings
Spectrum
Connection
Customer Rating
Cable
EarthLink
Connection
Customer Rating
Fiber
DSL
Fixed Wireless
AT&T
Connection
Customer Rating
Fiber
DSL
Fixed Wireless
i3 Broadband
Connection
Customer Rating
Fiber
Above are the top 4 providers in St. Clair County, IL for most people based on high speed internet coverage, speeds, and customer reviews. Click below to see all providers in your county.
Speed and technology may vary by address for all providers. Please note we may have a financial relationship with some of the providers above, which does not impact the customer ratings displayed. Customer ratings listed above are national ratings, local St. Clair County ratings may vary and are shown below.
Who is the Best Internet Provider in St. Clair County, IL?
Spectrum is the best internet provider in St. Clair County based on Illinois customer satisfaction ratings and reviews. Based on our extensive and unbiased survey, Spectrum had the best reviews at the local, state, and national levels versus all available providers in St. Clair County, making it a solid recommendation among providers with reviews. Spectrum is an option for 88.87% of the county.
or call 1-877-411-1381
The chart and table below show average customer ratings from customers in St. Clair County, Illinois, and customers throughout the country.
Top Rated Internet Providers in St. Clair County
Local, State, and National Ratings for all St. Clair County Internet Providers
| ISP / Tech Type | St. Clair County Overall | Illinois Overall | National Overall | For Service | ||
|---|---|---|---|---|---|---|
| Spectrum | (4) | (13) | (1738) | View Plans | ||
| HTC | (3) | (3) | (7) | View Plans | ||
| i3 Broadband | (0) |  (16) | (23) | View Plans | ||
| Verizon | (0) | (10) | (723) | View Plans | ||
| T-Mobile Home Internet | (0) | (14) | (284) | View Plans | ||
| AT&T | (0) | (47) | (924) | View Plans | ||
| Sparklight | (0) | (5) | (73) | View Plans | ||
| Mediacom | (0) | (17) | (84) | View Plans | ||
| Frontier | (0) | (4) | (143) | View Plans | ||
| Wisper Internet | (0) |  (1) | (2) | View Plans | ||
| Viasat | (0) |  (1) | (11) | View Plans | ||
| PCs for People | (0) | (0) |  (4) | View Plans | ||
| EarthLink | (0) | (0) | (12) | View Plans | ||
| HughesNet | (0) | (0) |  (18) | View Plans |
Based on 131 reviews from Illinois internet customers, Spectrum is the best internet service provider for St. Clair County residents. Spectrum was rated at an average of 3.08 out of 5 in our report for overall customer satisfaction. Harrisonville Telephone Company wins for second-place in Illinois, with 3.33 out of 5 stars and 2.6% coverage in St. Clair County.
At a national level, based on 4046 national reviews for any of the providers listed above, Harrisonville Telephone Company is rated higher than any other provider, with a rating of 3.37 out of 5.
Which Providers are Available at my Home in St. Clair County?
a different provider.
Internet Availability Key
Speeds and coverage vary within the county, and sometimes even from block to block. The map shows speeds per provider and where each provider is available.
Who is the Fastest Internet Provider in St. Clair County?
According to unbiased feedback from real internet customers in the county, they reported being happiest with speeds provided by Spectrum. On the other hand, based on data provided by the internet providers to the FCC, i3 Broadband should have faster speeds at a local level. While we typically put more weight on real-world customer ratings, we display both satisfaction and technical maximum information for customers to decide for themselves.
Data Reported to FCC by ISPs: Average Maximum Available in St. Clair County
| ISP / Tech Type | Max Advertised Speed | ||
|---|---|---|---|
| i3 Broadband | 8,000 Mbps | ||
| Frontier Communications | 7,000 Mbps | ||
| AT&T | 5,000 Mbps | ||
| EarthLink | 5,000 Mbps | ||
| Mediacom | 1,000 Mbps | ||
| Sparklight | 1,000 Mbps | ||
| Harrisonville Telephone Company | 1,000 Mbps | ||
| Spectrum | 1,000 Mbps | ||
| Wisper Internet | 800 Mbps | ||
| Verizon | 300 Mbps | ||
| T-Mobile Home Internet | 100 Mbps | ||
| Viasat | 100 Mbps | ||
| PCs for People | 50 Mbps | ||
| HughesNet | 25 Mbps |
Customer Ratings for Internet Provider Speeds in St. Clair County
| ISP / Tech Type | St. Clair County Speed | Illinois Speed | National Speed | For Service | ||
|---|---|---|---|---|---|---|
| Spectrum | (4) | (13) | (1738) | View Plans | ||
| HTC | (3) | (3) | (7) | View Plans | ||
| i3 Broadband | (0) | (16) | (23) | View Plans | ||
| T-Mobile Home Internet | (0) | (14) | (284) | View Plans | ||
| Mediacom | (0) | (17) | (84) | View Plans | ||
| Verizon | (0) | (10) | (723) | View Plans | ||
| Sparklight | (0) | (5) | (73) | View Plans | ||
| AT&T | (0) | (47) | (924) | View Plans | ||
| Frontier | (0) | (4) | (143) | View Plans | ||
| Wisper Internet | (0) | (1) | (2) | View Plans | ||
| Viasat | (0) | (1) |  (11) | View Plans | ||
| PCs for People | (0) | (0) | (4) | View Plans | ||
| EarthLink | (0) | (0) | (12) | View Plans | ||
| HughesNet | (0) | (0) | (18) | View Plans |
Based on data reported by St. Clair County ISPs to the FCC, the fastest speeds in the county are available through i3 Broadband. The company offers speeds up to 8,000 Mbps in St. Clair County. Therefore, the average customer can get up to 8,000 Mbps if they're willing to purchase the fastest subscription tier available at their homes.
Additionally, actual customers in the county rated their satisfaction with internet speed highest with Spectrum. This indicates Spectrum reliably delivers speeds expected by the customer based on the plan they are paying for.
Who is the Cheapest Internet Provider in St. Clair County?
Illinois customers rate Spectrum as the cheapest internet service provider in state. Data comes from customers in the state rating their satisfaction with pricing. This feedback is valuable because it considers price changes and whether the speeds paid for are worth it.
Spectrum received a local rating of 4.00 out of 5, which is lower than the average across all internet providers in the country. Harrisonville Telephone Company is rated in second place for affordability by the company’s St. Clair County customers with an average price rating of 2.33 out of 5.
The chart and graph below show how customers in St. Clair County, Illinois, and the United States rated the affordability of their internet service.
Rated Affordability in St. Clair County
| ISP / Tech Type | St. Clair County Affordability | Illinois Affordability | National Affordability | For Service | ||
|---|---|---|---|---|---|---|
| Spectrum | (4) | (13) | (1738) | View Plans | ||
| HTC | (3) | (3) | (7) | View Plans | ||
| i3 Broadband | (0) | (16) | (23) | View Plans | ||
| Frontier | (0) | (4) | (143) | View Plans | ||
| Verizon | (0) | (10) | (723) | View Plans | ||
| T-Mobile Home Internet | (0) | (14) | (284) | View Plans | ||
| AT&T | (0) | (47) | (924) | View Plans | ||
| Sparklight | (0) | (5) | (73) | View Plans | ||
| Mediacom | (0) | (17) | (84) | View Plans | ||
| Wisper Internet | (0) | (1) | (2) | View Plans | ||
| Viasat | (0) | (1) | (11) | View Plans | ||
| PCs for People | (0) | (0) | (4) | View Plans | ||
| EarthLink | (0) | (0) | (12) | View Plans | ||
| HughesNet | (0) | (0) | (18) | View Plans |
St. Clair County Internet Health Assessment
ISP Reports evaluates the technological infrastructure across the United States. This includes assessing a grade for ISP providers and infrastructure in the county and setting an index number for the digital connectivity of its residents. You can view the ISP Report Card and the Digital Connectivity Index for St. Clair County below, including the metrics used and how St. Clair County compares to the rest of Illinois and nation.
| Metric
(hover for details)
|
St. Clair County | Illinois | USA | ||
|---|---|---|---|---|---|
| Fiber Availability Percent The percentage of households in St. Clair County that have a Fiber internet connection available to their home. | 38.78% | 44.05% | 67.25% | ||
| Average Download SpeedThe maximum download speed most households can get on average. This is measured by availability in a block group and weighted by the population in that area. | 2,726 Mbps | 2,791 Mbps | 3,293 Mbps | ||
| Provider CountThe number of providers available for most people. This is a weighted average by block rather than a total for St. Clair County. | 6.2 | 7.1 | 6.8 |
| Average Household SizeA larger household size in a county indicates that there will be a greater need for bandwidth due to simultaneous usage, multiple devices, and network congestion. | 2.6 | 2.6 | 2.7 | ||
| Work From Home PercentA higher percent of the population working from home indicates bandwidth requirements being more widely needed rather than consolidated to commercial portions of the city. | 12% | 14% | 14% | ||
| Households with DevicesA higher percentage of households with computing devices in the home indicates a higher level of infrastructure needed to support those households. | 94% | 95% | 95% | ||
| Households with InternetA higher percentage of households with internet indicates a higher need for usage and connectivity in people’s daily lives. | 90% | 90% | 90% | ||
| Households with BroadbandA higher percentage of households with a broadband connection (defined as speeds above 25 Mbps) indicates heavier usage needs within these households. | 72% | 74% | 75% | ||
| Broadband Usage vs. AvailabilityThis measures what percentage of households who have a broadband connection to their home actually have an active subscription to that service. | 73% | 75% | 76% |
Our demographic data is sourced from the latest 5-year release of the American Community Survey by the US Census Bureau.
St. Clair County ISP Report Card & Digital Connectivity Index
The ISP Report Card in St. Clair County is B-, which is better than other counties. The local demand for broadband internet connectivity in St. Clair County is high with a score of 62 / 100 in our Digital Connectivity Index. This means that internet service providers operating in St. Clair County have done a good job meeting the needs of its residents.
The St. Clair County ISP Report Card evaluates the county on availability and speed metrics compared to other counties in the United States. ISP Infrastructure can vary greatly and on its own isn’t a perfect measure of what a county needs. Please see our ISP Report Card along with the Digital Connectivity Index above to evaluate how well the connectivity demand is met by the existing infrastructure.
90% of St. Clair County households have an internet connection despite having 98.41% availability. 72% of households have fiber, cable, or DSL, 8% have satellite, 0% are still on dial-up, and 3% of households have internet but don’t pay for a subscription because it’s subsidized by the Affordable Connectivity Program.
As you can see in the table above, while 72% of households have a broadband connection such as fiber, cable or DSL available to their home, 73% subscribe to it. A large amount of St. Clair County residents are taking advantage of the available internet infrastructure.
For more details, please visit our ISP Report Card and Digital Connectivity Index pages.
How do Neighboring Counties Compare to St. Clair County?
- ISP Report Card: B+
- Digital Connectivity Index: 47 / 100
- ISP Report Card: B+
- Digital Connectivity Index: 73 / 100
- ISP Report Card: A-
- Digital Connectivity Index: 53 / 100
- ISP Report Card: C
- Digital Connectivity Index: 34 / 100
- ISP Report Card: C+
- Digital Connectivity Index: 50 / 100
- ISP Report Card: C
- Digital Connectivity Index: 36 / 100
- ISP Report Card: B-
- Digital Connectivity Index: 30 / 100
- ISP Report Card: C-
- Digital Connectivity Index: 34 / 100
- ISP Report Card: A-
- Digital Connectivity Index: 24 / 100
How Much Speed does a St. Clair County Household Need?
Higher speed is typically preferred, but that comes at a higher price. The average size of a household in St. Clair County is 2.6, which is smaller than the Illinois average of 2.6 and smaller than the national average of 2.7. St. Clair County's average household income is $85,329 which is higher than the Illinois average of $93,298 and higher than the national average of $90,606. Homes with more people living in them and with higher incomes tend to indicate more devices being used more often.
St. Clair County also has 16% of its population enrolled in school between the 6th grade and college level, this is higher than the Illinois average of 16%. Additionally, 12% of residents work from home, which is lower than the 14% of residents in Illinois who work from home. This and other factors you can see above show us that the community of St. Clair County has a high need for internet connectivity and speeds.
Compared to the rest of the country, St. Clair County households are about average when it comes to technological engagement. 94% of households have some sort of computing device, 80% have desktops or laptops in the home, and 91% have smartphones. To see what speeds you are currently getting, please visit our internet speed test tool.
Which Fiber Internet Providers are Available in St. Clair County?
EarthLink Fiber in St. Clair County, IL
Availability:
18.8%
Customer Rating:
(5)
Avg. Download Speed
3,100 Mbps
EarthLink offers Fiber service to 18.8% of St. Clair County homes. Across the county, EarthLink Fiber has speeds up to 3,100 Mbps, with speeds from 1,000 Mpbs up to 5,000 Mbps depending on the address. Upload speeds are symmetrical, meaning they are exactly the same as download speeds for EarthLink Fiber. EarthLink Fiber is rated about the same as other types of internet service available in St. Clair County from EarthLink in terms of customer satisfaction.
AT&T Fiber in St. Clair County, IL
Availability:
18.8%
Customer Rating:
(544)
Avg. Download Speed
3,100 Mbps
AT&T offers Fiber service to 18.8% of St. Clair County homes. Across the county, AT&T Fiber has speeds up to 3,100 Mbps, with speeds from 1,000 Mpbs up to 5,000 Mbps depending on the address. Upload speeds are symmetrical, meaning they are exactly the same as download speeds for AT&T Fiber. AT&T Fiber is rated higher than other types of internet service available in St. Clair County from AT&T in terms of customer satisfaction.
i3 Broadband Fiber in St. Clair County, IL
Availability:
17.4%
Customer Rating:
(22)
Avg. Download Speed
8,000 Mbps
i3 Broadband offers Fiber service to 17.4% of St. Clair County homes. Across the county, i3 Broadband Fiber is the only type of service available from the company, with speeds up to 8,000 Mbps
Frontier Fiber in St. Clair County, IL
Availability:
3.9%
Customer Rating:
(110)
Avg. Download Speed
5,319 Mbps
Frontier Communications offers Fiber service to 3.9% of St. Clair County homes. Across the county, Frontier Fiber has speeds up to 5,319 Mbps, with speeds from 5,000 Mpbs up to 7,000 Mbps depending on the address. Upload speeds are symmetrical, meaning they are exactly the same as download speeds for Frontier Fiber. Frontier Fiber is rated higher than other types of internet service available in St. Clair County from Frontier in terms of customer satisfaction.
Which Cable Internet Providers are Available in St. Clair County?
Spectrum Cable in St. Clair County, IL
Availability:
88.6%
Customer Rating:
(1,618)
Avg. Download Speed
1,000 Mbps
Spectrum offers Cable service to 88.6% of St. Clair County homes. Across the county, Spectrum Cable is the only type of service available from the company, with speeds up to 1,000 Mbps
Sparklight Cable in St. Clair County, IL
Availability:
1.9%
Customer Rating:
(50)
Avg. Download Speed
1,000 Mbps
Sparklight offers Cable service to 1.9% of St. Clair County homes. Across the county, Sparklight Cable is the only type of service available from the company, with speeds up to 1,000 Mbps
Mediacom Cable in St. Clair County, IL
Availability:
1.7%
Customer Rating:
(71)
Avg. Download Speed
1,000 Mbps
Mediacom offers Cable service to 1.7% of St. Clair County homes. Across the county, Mediacom Cable is the only type of service available from the company, with speeds up to 1,000 Mbps
Which DSL Internet Providers are Available in St. Clair County?
EarthLink DSL in St. Clair County, IL
Availability:
71.9%
Customer Rating:
(4)
Avg. Download Speed
66 Mbps
EarthLink offers DSL service to 71.9% of St. Clair County homes. Across the county, EarthLink DSL has speeds up to 66 Mbps, with speeds from 10 Mpbs up to 100 Mbps depending on the address. Upload speeds differ from download speeds, and are as low 1.0 and as high as 20, with an average of 14 Mbps throughout the county. EarthLink DSL is rated the same as other types of internet service available in St. Clair County from EarthLink in terms of customer satisfaction.
AT&T DSL in St. Clair County, IL
Availability:
71.9%
Customer Rating:
(304)
Avg. Download Speed
66 Mbps
AT&T offers DSL service to 71.9% of St. Clair County homes. Across the county, AT&T DSL has speeds up to 66 Mbps, with speeds from 10 Mpbs up to 100 Mbps depending on the address. Upload speeds differ from download speeds, and are as low 1.0 and as high as 20, with an average of 14 Mbps throughout the county. AT&T DSL is rated about the same as other types of internet service available in St. Clair County from AT&T in terms of customer satisfaction.
Frontier DSL in St. Clair County, IL
Availability:
5.1%
Customer Rating:
(46)
Avg. Download Speed
28 Mbps
Frontier Communications offers DSL service to 5.1% of St. Clair County homes. Across the county, Frontier DSL has speeds up to 28 Mbps, with speeds from 10 Mpbs up to 115 Mbps depending on the address. Upload speeds differ from download speeds, and are as low 1.0 and as high as 7.0, with an average of 2.0 Mbps throughout the county. Frontier DSL is rated lower than other types of internet service available in St. Clair County from Frontier in terms of customer satisfaction.
HTC DSL in St. Clair County, IL
Availability:
2.6%
Customer Rating:
(1)
Avg. Download Speed
86 Mbps
Harrisonville Telephone Company offers DSL service to 2.6% of St. Clair County homes. Across the county, HTC DSL is the only type of service available from the company, with speeds up to 86 Mbps, with speeds from 10 Mpbs up to 100 Mbps depending on the address. Upload speeds differ from download speeds, and are as low 1.0 and as high as 20, with an average of 17 Mbps throughout the county.
Which Fixed Wireless and LTE Internet Providers are Available in St. Clair County?
T-Mobile Home Internet Fixed Wireless in St. Clair County, IL
Availability:
94.9%
Customer Rating:
(0)
Avg. Download Speed
59 Mbps
T-Mobile Home Internet offers Fixed Wireless service to 94.9% of St. Clair County homes. Across the county, T-Mobile Home Internet Fixed Wireless is the only type of service available from the company, with speeds up to 59 Mbps, with speeds from 25 Mpbs up to 100 Mbps depending on the address. Upload speeds differ from download speeds, and are as low 3.0 and as high as 20, with an average of 11 Mbps throughout the county.
Wisper Internet Fixed Wireless in St. Clair County, IL
Availability:
60.8%
Customer Rating:
(0)
Avg. Download Speed
162 Mbps
Wisper Internet offers Fixed Wireless service to 60.8% of St. Clair County homes. Across the county, Wisper Internet Fixed Wireless is the only type of service available from the company, with speeds up to 162 Mbps, with speeds from 10 Mpbs up to 800 Mbps depending on the address. Upload speeds differ from download speeds, and are as low 1.0 and as high as 250, with an average of 21 Mbps throughout the county.
Verizon Fixed Wireless in St. Clair County, IL
Availability:
52.2%
Customer Rating:
(0)
Avg. Download Speed
300 Mbps
Verizon offers Fixed Wireless service to 52.2% of St. Clair County homes. Across the county, Verizon Fixed Wireless is the only type of service available from the company, with speeds up to 300 Mbps
EarthLink Fixed Wireless in St. Clair County, IL
Availability:
49.2%
Customer Rating:
(0)
Avg. Download Speed
43 Mbps
EarthLink offers Fixed Wireless service to 49.2% of St. Clair County homes. Across the county, EarthLink Fixed Wireless has speeds up to 43 Mbps, with speeds from 25 Mpbs up to 100 Mbps depending on the address. Upload speeds differ from download speeds, and are as low 3.0 and as high as 20, with an average of 7.0 Mbps throughout the county.
AT&T Fixed Wireless in St. Clair County, IL
Availability:
49.2%
Customer Rating:
(0)
Avg. Download Speed
43 Mbps
AT&T offers Fixed Wireless service to 49.2% of St. Clair County homes. Across the county, AT&T Fixed Wireless has speeds up to 43 Mbps, with speeds from 25 Mpbs up to 100 Mbps depending on the address. Upload speeds differ from download speeds, and are as low 3.0 and as high as 20, with an average of 7.0 Mbps throughout the county.
PCs for People Fixed Wireless in St. Clair County, IL
Availability:
3.5%
Customer Rating:
(0)
Avg. Download Speed
50 Mbps
PCs for People offers Fixed Wireless service to 3.5% of St. Clair County homes. Across the county, PCs for People Fixed Wireless is the only type of service available from the company, with speeds up to 50 Mbps
Which ISP Should You Choose in St. Clair County?
The right ISP for you depends upon your needs, but in general we can make the following suggestions:
- The best all-around internet service provider in St. Clair County is Spectrum.
- The fastest internet provider should be i3 Broadband. Considering speed for the money and reliability in speeds, Spectrum may be a better choice based on real-world local customer feedback.
- The most affordable internet provider in St. Clair County is Spectrum.
- HughesNet, T-Mobile Home Internet, and Viasat has the broadest coverage in St. Clair County, and is most likely to cover your home. To find out exactly what's available at your home, please use our address search tool.
How does St. Clair County compare to other cities with a similar population?
To see how St. Clair County stacks up on the national level, it's useful to look at some other cities with similarly sized populations. Below you can see a list of these cities and how they compare to St. Clair County's B- ISP Report Card and 62 / 100 Digital Connectivity Index.
- ISP Report Card: B
- Digital Connectivity Index: 67 / 100
- ISP Report Card: B
- Digital Connectivity Index: 64 / 100
- ISP Report Card: B
- Digital Connectivity Index: 53 / 100
- ISP Report Card: B-
- Digital Connectivity Index: 63 / 100
- ISP Report Card: B
- Digital Connectivity Index: 80 / 100
- ISP Report Card: B+
- Digital Connectivity Index: 71 / 100
- ISP Report Card: C
- Digital Connectivity Index: 55 / 100
- ISP Report Card: B+
- Digital Connectivity Index: 70 / 100
- ISP Report Card: B+
- Digital Connectivity Index: 56 / 100