Gazelle Process & Investigations
“The people at Gazelle are so Amazing and Professional I cant say how happy I am with Paul and his team thank you so much Gazelle for everything”
Best Private Investigators near Crystal Lake, IL
1 of these agencies is based in Crystal Lake; the others serve Crystal Lake from towns including Arlington Heights (20 mi), Algonquin (4 mi) and Elgin (13 mi).
3 open 24/7 · 5 open weekends · 6 rated 4.5+ · 4 show a license
Data verified October 18, 2026
Detectives.com
International Trace
“I have used them on several sensitive projects and they have always come through with positive results, on time and within budget.”
LWM Research
SCS & Associates
American Sentinel
The 10 agencies on this page are the private investigators listed for Crystal Lake, 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: Crystal Lake, IL
7 of the 10 agencies on this page have a rating, from 3.9 to 5.0 across 95 reviews; 1 has 50 or more reviews and 6 are rated 4.5 or higher. 3 are open around the clock and 5 are open on weekends. The services the agencies on this page list most often on their websites are surveillance (3), criminal investigations (2) and insurance investigations (2). 4 show a license on their websites. Domain records put 8 websites of the agencies on this page at ten or more years old; the oldest dates from 1997. 3 offer urgent consultations and 1 lists coupons or special offers. We have a website on file for all 10 of the agencies on this page; all 10 publish a contact page and 9 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.
Which investigators listed for Crystal Lake describe their work online?
All 10 agencies on this page have a website on file. Those pages are where an agency states its license, the kinds of investigation it takes on, and whether it works mainly for attorneys, for companies or for private clients. That last point changes how a report gets written.
Special Solutions
“Investigator Kelley was amazing and really came through assisting with my situation.”
H Brown Investigations
“Harry brown is the most effective investigator i have ever dealt with in all the years of my criminal law practice.”
Chicago PI Services Group
“He listened to what we needed done, then determined how we could move forward.”
VTS Investigations
Why these companies made our list
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