A-1 Detective Agency
“I had reached out to several others given the short timeframe but I knew within the first few minutes of talking to Darryl that he would be able to take care of it.”
Best Private Investigators near Waukegan, IL
2 of these agencies are based in Waukegan; the others serve Waukegan from towns including Kenosha, WI (15 mi), Arlington Heights (20 mi) and Gurnee (4 mi).
4 open 24/7 · 7 open weekends · 6 rated 4.5+ · 3 show a license
Data verified October 21, 2026
R7 Investigations
3 Kings Private Security
“Hiring 3 kings private security helped put my mind at ease from a scary situation.”
Firefly Investigations
“I'm more than happy with the results I received and to be honest it was 100% more than anticipated!”
Scoutlogic Pre-Employment Background Screening
“I would highly recommend anyone to use this company for background checks, drug screens, credit reports, driving records etc.”
H Brown Investigations
“Harry brown is the most effective investigator i have ever dealt with in all the years of my criminal law practice.”
The 10 agencies on this page are the private investigators listed for Waukegan, 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: Waukegan, IL
The 10 agencies on this page are rated from 3.2 to 5.0 across 123 reviews; 6 are rated 4.5 or higher. 4 are open around the clock; 7 are open on Saturdays and 6 on Sundays. 3 show a license on their websites and 1 has a BBB rating of A or A+. Domain records put 5 websites of the agencies on this page at ten or more years old; the oldest dates from 2012. 4 offer urgent consultations; 1 offers a free initial consultation; 1 is family- or locally-owned and 1 lists coupons or special offers. We have a website on file for all 10 of the agencies on this page; 6 publish a contact page and 6 list a public email. 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 Waukegan shown here?
2 of the 10 agencies have an address in Waukegan. 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.
KM Investigations and Security
“Once my client or I hire Kevin, we can always count on him to get the job done.”
The All-Investigations Group
“If you are looking for professional, compassionate, and urgent attention to your matter, The All-Investigations Group is an excellent choice!”
Special Solutions
“I will definitely be using them again, if needed, and would highly recommend them to anyone.”
Chicago PI Services Group
“He listened to what we needed done, then determined how we could move forward.”
Why these companies made our list
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