Best Private Investigators near Upland, CA
1 of these agencies is based in Upland; the others serve Upland from towns including Rancho Cucamonga (5 mi), Glendora (11 mi) and Claremont (4 mi).
1 open 24/7 · 5 open weekends · 9 rated 4.5+ · 6 show a license
Data verified October 21, 2026
Bosco Legal Services
“Bosco Legal Services staff is friendly, efficient and have been responsive multiple times I have used them.”
Tag Force Security & Patrol Services
Pyrocop
A Pineda Polygraph Services
“Even though I gave him a hard time due to stress was extremely helpful and he possibly saved my marriage of 8 years.”
Stone Investigation Services
“Has made a big difference in our cases.”
The 12 agencies on this page are the private investigators listed for Upland, 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: Upland, CA
11 of the 12 agencies on this page have a rating, from 3.9 to 5.0 across 57 reviews; 9 are rated 4.5 or higher. 1 is open around the clock; 5 are open on Saturdays and 2 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. 1 offers urgent consultations; 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; 7 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.
Which investigators listed for Upland describe their work online?
11 of the 12 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.
Inland Professional Investigations
“If you are seeking a private investigator don't hesitate contacting Inland Professional Investigations.”
PAX Investigations
“I have utilized their services on multiple occasions and each time I have been throughly impressed with the professionalism and attention to detail their team has brought.”
Smarthire
XPD Investigations
Joe Mar Polygraph & Investigation Services
“And Highly recommended to Anyone that needs Accurate Results.”
Cobalt Consulting and Investigations
Why these companies made our list
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