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DSDownloadSpeed
FCC Data · Updated April 2026
B

Best Internet in St. Clair, IL

1000 Mbps avg · 27 ZIP codes · 100% fiber · 10 providers/ZIP

1000
Avg Mbps
1,000
Max Mbps
100%
Fiber Access
10
Avg Providers
Providers

Internet Providers in St. Clair

ProviderZIP Codes Served% of Area
Comcast27100%
At&T Illinois27100%
T-Mobile27100%
King Street L.p.27100%
United States Cellular Corporation27100%
Rise Broadband27100%
Frontier North Illinois Gte27100%
Wisper Isp, LLC27100%
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ZIP Codes in St. Clair

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FAQ

Frequently Asked Questions

What is the average internet speed in St. Clair, IL?

St. Clair, Illinois has an average maximum download speed of 1000 Mbps across 27 ZIP codes. The fastest available speed is 1000 Mbps. 100% of ZIP codes have fiber internet.

Who are the best internet providers in St. Clair?

The most widely available providers in St. Clair are Comcast (27 ZIPs), At&T Illinois (27 ZIPs), T-Mobile (27 ZIPs). Check individual ZIP codes for exact availability at your address.

Is fiber internet available in St. Clair?

Yes, fiber internet is available in 100% of St. Clair's ZIP codes. Fiber coverage is good in this area. Search your specific ZIP code for exact fiber availability.

How does St. Clair compare to the rest of Illinois?

St. Clair has an average Broadband Grade of B (71/100). The St. Clair area averages 10 providers per ZIP code with 100% fiber access. Check the Illinois overview for statewide comparison.