Best Private Investigators near Rancho Cucamonga, CA
2 of these agencies are based in Rancho Cucamonga; the others serve Rancho Cucamonga from towns including Riverside (16 mi), Upland (5 mi) and Fontana (6 mi).
5 open weekends · 11 rated 4.5+ · 6 show a license
Data verified October 18, 2026
XPD Investigations
Bosco Legal Services
“Bosco has helped my firm on numerous occasions.”
Tag Force Security & Patrol Services
Stone Investigation Services
“Has made a big difference in our cases.”
Inland Professional Investigations
“Very happy with how Inland Professional Investigations handled my background investigation.”
The 13 agencies on this page are the private investigators listed for Rancho Cucamonga, CA. 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: Rancho Cucamonga, CA
12 of the 13 agencies on this page have a rating, from 3.9 to 5.0 across 62 reviews; 11 are rated 4.5 or higher. 5 are open on Saturdays and 1 on Sundays. 6 show a license on their websites and 1 has a BBB rating of A or A+. 7 have ten or more years of experience, the longest 62 years. 3 offer a free initial consultation and 2 are family- or locally-owned. We have a website on file for 11 of the agencies on this page; 8 publish a contact page and 5 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 Rancho Cucamonga shown here?
2 of the 13 agencies have an address in Rancho Cucamonga. 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.
PAX Investigations
“Their team went above and beyond to gather crucial information for my case, delivering results promptly and discreetly.”
Integrity Legal Support Services
“I have also used them to handle a couple personal matters, and have been equally satisfied.”
Smarthire
Fugitive Recovery Agent
Joe Mar Polygraph & Investigation Services
“And Highly recommended to Anyone that needs Accurate Results.”
Cobalt Consulting and Investigations
Gonzalez Exclusive Invstgtv
Why these companies made our list
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