Private Investigators Private Detectives locations near Westmont, IL

Showing 1–10 of 10 results

We track 10 private investigators private detectives listings in and around Westmont, IL, spread over 3 ZIP codes. Listings here were last checked in Aug 2026.

TRI County Investigations

Private Investigators & Private Detectives

📍 621 Plainfield Rd Suite 204 Ste 204, Willowbrook, IL, 60527

📞 630-655-1313

Tri County Investigations is a fully electronic office with a more extensive staff servicing the entire state of Illinois. We are committed to providing quick and efficient service of process and investigative tasks that you may require. We are able to receive, disperse and return documents via email, fax and/or USPS. We are available anytime of the day or night. You can be confident in knowing that we will apply every capability within our cutting edge resources to each document we are given. Combining the aforementioned means, along with the skills and perseverance of our knowledgeable staff, Tri County Investigations is able to fulfill all of your needs insuring that every service is performed to your satisfaction.

Conrad Polygraphy & F L Hunter & Associates Inc

Private Investigators & Private Detectives

📍 930 York Rd, Hinsdale, IL, 60521

📞 630-920-0571

Updated Aug 2026

Wicklander-Zulawski & Associates

Private Investigators & Private Detectives

📍 4932 Main St, Downers Grove, IL, 60515

📞 630-852-6800

🌐 w-z.com

Wicklander-Zulawski & Associates is a private investigative firm located in Downers Grove, Illinois. The company has an active online presence as of 2026, indicating ongoing engagement with clients. Those in need of investigative services can reach out to this firm for assistance in various matters.