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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.”
Best Private Investigators near Glendora, CA
2 of these agencies are based in Glendora; the others serve Glendora from towns including Los Angeles (32 mi), West Covina (7 mi) and San Dimas (3 mi).
6 open 24/7 · 15 open weekends · 16 rated 4.5+ · 9 show a license
Data verified October 16, 2026
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Smarthire
“Back ground checks and private investigating”
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Brapga Security Systems
- Thanks to Them
- Homeless
- Company
“I called a few days ago and spoke with Santos, he gave me good information, he was interested in an event service, he explained its security structure very well and finally we reached an agreement, the day of the event arrived and I was satisfied.”
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Excaliber Investigations
“Reliable, trustworthy and highly recommended investigated service.”
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Tag Force Security & Patrol Services
“This company is so great the supervisor is someone who will do the most for you and asks for a tiny return just show up and do your job I am so greatful and so blessed to be there thank you Tagforce”
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Schubert Investigations
- Expert
- Know
- Expectations
“I would like to thank him individually and the entire company for delivering such outstanding and professional service for their clients and know that this brief review cannot encompass the full experience of being helped when so many other people ha...”
The 24 agencies on this page are the private investigators listed for Glendora, 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: Glendora, CA
20 of the 24 agencies on this page have a rating, from 3.9 to 5.0 across 483 reviews; 3 have 50 or more reviews and 16 are rated 4.5 or higher. 6 are open around the clock; 15 are open on Saturdays and 10 on Sundays. The services the agencies on this page list most often on their websites are background checks (2), missing persons (2) and surveillance (2). 9 show a license on their websites and 7 have a BBB rating of A or A+. 15 have ten or more years of experience, the longest 62 years. 6 offer urgent consultations; 7 offer a free initial consultation and 1 is family- or locally-owned. 1 has Spanish-speaking staff. We have a website on file for 23 of the agencies on this page; 16 publish a contact page and 10 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 Glendora shown here?
2 of the 24 agencies have an address in Glendora. 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.
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California Recovery Investigations
- Process Server
“I was having some questions about whether or not my significant other was stepping outside of our relationship, so I hired Kevin at California recovery investigations.”
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Inland Professional Investigations
“If you are seeking a private investigator don't hesitate contacting Inland Professional Investigations.”
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PAX Investigations
- Attention
- Team
“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.”
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Fugitive Recovery Agent
“No fuss”
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Professional Solutions
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Joe Mar Polygraph & Investigation Services
“This is the second time I had to do finger prints because the other place did something wrong.”
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Cobalt Consulting and Investigations
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Streamline Investigations
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全美侦探调查 American Professional Investigations
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Paramount Investigative Services
- Results
- Company
- Job
“By the time I made it to the city, several hours had passed and still no luck but, the investigators did not give up and encouraged me to not lose hope.”
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Sunset Blvd. Investigations
- Compassion
- PI
- Team
“An hour later, we walked out to the end of the pier and there was my son, sitting on a bench with his belongings and quietly looking out over the sea at an aircraft carrier in the distance.”
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Peterson Investigations
- Security
- Integrity
- Team
“Peterson Investigation was able to achieve exactly what we needed to submit with our legal court documents, with quick response time and even rush services!”
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L&B Services
- Knowledge
- Notary
- Needs
“I really really highly recommend L&B services they take their time to explain the process of your case they really know what they're doing my case is for custody and child support and I honestly I am very glad that I found them to help me.”
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MCM Investigations
“Sooooo gooooood”
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Bosco Legal Services
- Job
- Asset
- Company
“Not only did they go way above and beyond, they also were very understanding of my newbie and clueless status, very helpful and very accommodating to my communication needs.”
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Breakpoint Investigations
- Efficient
- Company
- Call
“When I contacted Break Point investigations Karen ask me all about my case I told her that is a CH100 Request for Civil Harassment Restraining Order and a TRO.”
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Lockjaw Legal Process Services
- Company
“Now I understand "LOCKJAW" they wont stop until the job is done.”
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Rush Intel Services
“I used Rush Intel for some private investigative work involving some fraud that my company had sustained.”
Private Detective Services in Glendora, CA Cost Estimates
Minimum cost
$310
Maximum cost
$9802
National Average
$1239
Avg Per Hour Rates
$129
$723
$2064
Average price range is based on 430 cost profiles
Why these companies made our list
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