Illinois fiber built for reach and resilience.
From Mattoon to St. Louis, discover premier fiber internet Illinois businesses trust for reach, diversity, and enterprise reliability.
Illinois network —reach, reliability, results.
With over 2,800 of fiber route miles and a 9,600+ on- and near-net presence across key markets, Fidium’s fiber connectivity solutions for businesses in Illinois network connects business hubs from Chicago to Champaign, Mattoon, and Springfield—with reach extending into St. Louis and Indianapolis. Our Illinois fiber infrastructure is backed by a 24/7/365 Network Operations Center and supported by regional experts, our network delivers the performance, diversity, and scale to fuel business growth across the Midwest.
Backed by scale. Built for what’s next.
Our Illinois network is engineered for scale, availability, and growth in high-demand markets.
2,800+
Fiber route miles.
2,200+
On-net buildings.
7,400+
Near-net buildings.
99.999%
Core network availability.
Fiber infrastructure, purpose-built for performance and scale.
Fidium’s Illinois fiber network isn’t just large—it’s engineered with strategic diversity, performance, and enterprise ownership in mind.
Key Markets
Serving Wire Centers
Data Center Connectivity
POPs
Designed to support mission-critical demands, complex architectures, and high-growth connectivity needs, our network delivers the diversity, reach, and resilience required to move faster, build smarter, and stay ahead.
Why Fidium’s network makes a difference:
Our fiber connectivity solutions for business in Illinois aren’t just built to keep up—they’re built to give you a competitive edge.
Dense Metro & Regional Coverage
Fiber-rich infrastructure in major metros and underserved areas alike.
Enterprise-Ready Core
100G core network with upgradeable capacity, diverse paths and high availability.
Always Expanding
New fiber builds and smart-growth investments announced regularly.