Expro Security & Investigations
“One call at 2am and they sent someone out who worked a 20 hour shift without complaint.”
Best Private Investigators near Allen, TX
2 of these agencies are based in Allen; the others serve Allen from towns including Plano (6 mi), McKinney (6 mi) and Frisco (9 mi).
4 open 24/7 · 8 open weekends · 12 rated 4.5+ · 8 show a license
Data verified October 21, 2026
Nighthawk Investigations
“No idea how they do it, but they are very very very good.”
Blackfish Intelligence
“Unlike most who try to up sell you, they give you the options, the pros, cons and costs and help you make the right decision.”
Private Investigation Endeavors
“David was absolutely incredible—he gave great advice and never made me feel rushed.”
Sky Investigations
“Super professional, incredibly speedy with the task I handed him, and to top it off; my expectation of privacy was paramount to everything else!”
Axis Investigative Services
“They always accomplish what we need done.”
The 15 agencies on this page are the private investigators listed for Allen, TX. 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: Allen, TX
14 of the 15 agencies on this page have a rating, from 4.4 to 5.0 across 274 reviews; 1 has 50 or more reviews and 12 are rated 4.5 or higher. 4 are open around the clock; 8 are open on Saturdays and 5 on Sundays. 8 show a license on their websites and 1 has a BBB rating of A or A+. 6 have ten or more years of experience, the longest 26 years. 4 offer urgent consultations and 3 offer a free initial consultation. We have a website on file for 14 of the agencies on this page; 13 publish a contact page; 11 list a public email and 1 takes 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 Allen shown here?
2 of the 15 agencies have an address in Allen. 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.
911 Private Investigations
“Had results in a very timely manner.”
Conviction Integrity Group
“Our family hired Conviction Integrity Group after years of feeling like nobody was really listening to what we were saying about my brother's case.”
Preferred Intelligence
“I had a problem that needed his expertise and he came throgh timely and accurately.”
Menz Investigation Services
“He doesn't just take the assignment and run with it; he takes the time to listen, ask the right questions, understand exactly what I'm trying to accomplish, and identify what I actually need.”
Diligence International Group
“A great firm to contract with!”
4 Star Private Investigations
“I would definitely recommend him and use his services again if needed!”
John Demny Private Investigations
“Excellent, quick and professional job .”
MI:33
Dallas Ring Finders
“They are really good at what they do and I would highly recommend them I lost my class ring in Lewisville lake and they where pretty quick to action on they where very dedicated to finding it and I am so glad they did.”
Why these companies made our list
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