Equifax Corporate Headquarters. The increase of identity theft complaints in 2017 in Illinois is due, in part, to the massive data breach sustained by Equifax, one of the largest credit reporting agencies. (Photo Source: Equifax) Local AG Madigan Addresses Consumer Questions and Concerns Surrounding Equifax Data Breach by Press on September 14, 2017 Press Author More in Local: Park Forest’s Sandra Zoellner Retires After 21 Years of Service June 17, 2026 Save the date for The Prairie Party at theNate June 17, 2026 Governors State Has New Soccer Complex and New Men’s Coach June 17, 2026 Equifax Corporate Headquarters (Source: Equifax)