Illinois has 51 mapped data centers, ranking 9th in the United States by facility count. The state is home to 22 distinct operators, with Digital Realty the largest at 6 facilities. Chicago hosts 11 facilities — 21.6% of the state total.

Use the interactive Illinois data center map below to explore every mapped facility. Click any marker for the operator, location, and website. Use the Find nearest data center tool to measure distance from any point. Or view the national US data center map to compare Illinois to every other state.

Illinois Data Centers by the Numbers

• 51 mapped data centers across Illinois (OpenStreetMap data)
• 43 facilities have a documented name
• 42 facilities have a named operator
• 24 facilities publish a public website
• 22 distinct operators across 11 Illinois cities
• Chicago is the dominant cluster, with 11 facilities — 21.6% of the state total

Largest Data Center Operators in Illinois

The largest operators by facility count in Illinois:

Illinois Data Centers by City

The top Illinois cities ranked by mapped data center count:

Notable Data Centers in Illinois

A sample of named facilities from the OpenStreetMap dataset:

Why Chicago and the Western Suburbs Dominate Illinois

Greater Chicago is a major peering hub between East Coast and Midwest internet routes. Most facilities cluster in suburbs like Elk Grove Village, Aurora, and Itasca where power and fiber converge.

Data Centers in Neighboring States

Illinois shares borders with 5 states. Explore data center inventory in each:

• Wisconsin Data Centers Map — 12 facilities
• Iowa Data Centers Map — 59 facilities
• Missouri Data Centers Map — 15 facilities
• Kentucky Data Centers Map — 4 facilities
• Indiana Data Centers Map — 7 facilities

Frequently Asked Questions

How many data centers are in Illinois?

Illinois has 51 mapped data centers in the OpenStreetMap dataset, ranking 9th nationally by facility count. The figures are drawn from active telecom=data_center records in OpenStreetMap as of April 2026.

Which company has the most data centers in Illinois?

Digital Realty operates 6 of the mapped facilities in Illinois — the largest single operator presence in the state.

Which city in Illinois has the most data centers?

Chicago hosts 11 of Illinois’s mapped data centers, more than any other city in the state.

Where can I see a complete map of US data centers?

View the national US data center map — covering all 1,553 mapped US facilities, filterable by state or operator.

View all 1,553 mapped US data centers on the national interactive map

Data source: OpenStreetMap (telecom=data_center tag) as of April 2026, bucketed to states using US Census state boundaries. Coverage is strongest for major commercial colocation operators; smaller and private corporate facilities may be unmapped. To add a missing facility, edit it in OpenStreetMap and it will appear on the next data refresh.