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Elevate Investigations
“All the information we received was accurate and she was a pleasure to work with.”
Best Private Investigators near Fullerton, CA
3 of these agencies are based in Fullerton; the others serve Fullerton from towns including Santa Ana (11 mi), Orange (8 mi) and West Covina (12 mi).
2 open 24/7 · 10 open weekends · 13 rated 4.5+ · 7 show a license
Data verified October 31, 2026
Logic Investigations
“He shared his knowledge and expertise regarding our case and stayed in close communication with me providing frequent updates.”
EJM Digital
Blue Systems International
“A private investigator like MJ is hard to find since he has helped me with a very complicated case of background checks, complicated financial scam and litigation issues.”
Peterson Investigations
“I have worked with Eric and found him to be thoroughly engaged in the investigation.”
Brapga Security Systems
“Their presence has significantly improved safety, keeping the area free from homelessness and protecting our business, customers, and community.”
The 15 agencies on this page are the private investigators listed for Fullerton, 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: Fullerton, CA
14 of the 15 agencies on this page have a rating, from 4.3 to 5.0 across 278 reviews; 1 has 50 or more reviews and 13 are rated 4.5 or higher. 2 are open around the clock; 9 are open on Saturdays and 7 on Sundays. 7 show a license on their websites and 2 have a BBB rating of A or A+. 11 have ten or more years of experience, the longest 34 years. 2 offer urgent consultations; 6 offer a free initial consultation and 1 lists coupons or special offers. 1 has Spanish-speaking staff. We have a website on file for all 15 of the agencies on this page; 13 publish a contact page and 12 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 Fullerton shown here?
3 of the 15 agencies have an address in Fullerton. 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.
JPL Process Service
“Terrific customer service and complete transparency regarding what you'll be charged - no hidden fees for transportation, etc.”
Lockjaw Legal Process Services
“Very kind and helpful over the phone considering the situation.”
Gomez Investigations Unit- Detective Privado
“They are great at what they do and you will always get your money worth no matter the situation.”
Excaliber Investigations
“Reliable, trustworthy and highly recommended investigated service.”
Southern California Private Investigations
“I recommend Southern California Private Investigations Inc 100%”
Schubert Investigations
“I had to serve someone who made it very challenging to do so and Freeman went above and beyond to make sure she was served.”
Discreet Services
R.H. Young
“Young helped us in our search for our missing adult Son, we are from Missouri, so he was our boots on the ground in Santa Ana/ Costa Mesa.”
Threat Management and Protection
Why these companies made our list
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