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Great Lakes Professional Investigations
“Took a huge load off of my shoulders, thank you Great Lakes PI!!!”
Best Private Investigators near Naperville, IL
2 of these agencies are based in Naperville; the others serve Naperville from towns including Westmont (11 mi), Plainfield (9 mi) and Batavia (10 mi).
2 open 24/7 · 5 open weekends · 10 rated 4.5+ · 6 show a license
Data verified October 21, 2026
Squad 8-B Solutions
Chicago Intel Agency
“I received the information in a timely manner and was given additional information to ensure clarity.”
Uthe Investigations & Process Service
“Very prompt, is able to serve difficult to find and serve defendants.”
Krimson Investigations and Process Service
“Quick in communicating and responding to your questions and concerns will highly recommend there services.”
Millennium Investigations
“It is good to know there are people out there who will help you in your darkest hour and at when you need a helping hand the most.”
The 12 agencies on this page are the private investigators listed for Naperville, IL. What each one states about its license, its specialties and the areas it covers comes from its own website; ratings and quotes come from public reviews.
Area overview: Naperville, IL
11 of the 12 agencies on this page have a rating, from 4.4 to 5.0 across 265 reviews; 1 has 50 or more reviews and 10 are rated 4.5 or higher. 2 are open around the clock; 5 are open on Saturdays and 2 on Sundays. 6 show a license on their websites. 10 have ten or more years of experience, the longest 100 years. 2 offer urgent consultations. We have a website on file for 10 of the agencies on this page; 6 publish a contact page; 6 list a public email and 2 take bookings online. We count these figures across the agencies on this page; distances are straight-line, and hours and prices change, so confirm the details with the agency before you book.
Why are investigation agencies outside Naperville shown here?
2 of the 12 agencies have an address in Naperville. The others come from other towns. Investigators travel to the subject, so an office one county over is rarely the issue. State licensing is the thing to check.
Edward R Kirby & Associates
“They are honest as the day is long and they will give it their all to solve your problem.”
Impact Investigations
Argus Services
Force Process Serving & Investigations
Delorto Mazzola & Associates
Judicial Attorney Services
“Of course, there are times when the subject becomes uncooperative and service cannot be made, but I love that this company gives you the flexibility to go out whenever you can to get the job done right which in turn, increases the chance of your work to be served properly.”
Why these companies made our list
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