Tri County Investigations

Tri County Investigations is a state-licensed detective agency based in Willowbrook, Illinois. Established in 1976, the company provides legal support and investigative services for attorneys, government agencies, and individuals throughout Illinois, with a stated focus on careful document handling and due process support.

For notary-related needs, Tri County Investigations offers general notarization and mobile notary service formats. Its broader service list also includes skip tracing, private investigation, credit checks, FBI background checks, and other legal support functions.

The agency is described as fully bonded and insured, with office staff, process servers, licensed private detectives, and investigators supporting case-related work across the state.