Data Centers in Illinois
140 Facilities Tracked

81 data center operators maintain facilities in Illinois, led by Lumen (9). Beyond the headline leader, CyrusOne (7) and Digital Realty (7) maintain meaningful state-level presence and run distinct facility footprints by city and market segment. Counts on each operator card reflect facilities placed at a confirmed address inside the state, not aggregate national footprint, so in-state readers see only the operator's resident facility presence. Across the state, operator footprints span 47 cities, ranging from hyperscale campuses to carrier-neutral colocation and enterprise build-to-suit sites, with the largest concentrations in the cities listed below. Operator counts here measure each company's full in-state footprint; city totals elsewhere on the page count every operator's facilities inside that city, so the two metrics use different denominators by design.

Data center facilities in Illinois cluster around the Chicago metro corridor, distributed across 47 cities statewide. Chicago leads the distribution at 30 facilities, with Elk Grove Village close behind at 25, together accounting for a substantial share of Illinois's 140 tracked sites. Elk Grove Village's strength relative to the city proper reflects its established role as a northwest-suburban carrier-hotel and colocation hub, shaped by proximity to O'Hare and the dense fiber routes that converge through the corridor. Below the two leading markets, a secondary tier of suburban sites begins with Northlake (6) at 6 facilities. Per-city facility counts and operator attribution for all 47 Illinois markets appear in the city table below, with each market's verified facility records traceable back to the statewide total.

Illinois's data center market does not operate in isolation. Adjacent states including Indiana, Iowa, Kentucky, Missouri share long-haul fiber routes, regional power interconnects, and multi-state operator portfolios with the facilities tracked across Illinois, so capacity and siting decisions in one market routinely shape the next. The related-state directories below let researchers benchmark facility density, operator concentration, and metro distribution against these neighboring markets, and trace how the operators with the heaviest Illinois presence extend their footprints across the surrounding region. Comparing Illinois against its neighbors this way also shows at a glance whether the state anchors its regional data center cluster or ranks behind a larger adjacent market.

Common questions about data centers in Illinois, answered using verified data from ITAMG's multi-source directory of 140 facilities.

Every facility on this page has been compiled from the directory's 15 source datasets, including operator filings, regulatory disclosures, and industry databases, and cross-checked where more than one source reports it. ITAMG matches records by name, address, geographic coordinates, and operator identity, then collapses duplicates into a single canonical entry. Where a facility hosts multiple providers, the Index reports the facility operator, which may differ from a provider named in the facility's name. A facility appears here only when two conditions hold. First, the building must be locatable on a map by either coordinates or a verified street address. Second, the record must describe an actual data center, not a colocation reseller, a telco hub, or a paper-only mention in a financial filing. Records that fail either test are excluded.

Operator names and trademarks referenced on this page are property of their respective owners. ITAMG is an independent IT asset disposition company and is not affiliated with the data center operators listed.