Allen Investigations, Debra Allen
“The CI assistance for adoptees needing up to date medical history information was very very helpful to myself, my children and our grandchild.”
Best Private Investigators near Costa Mesa, CA
2 of these agencies are based in Costa Mesa; the others serve Costa Mesa from towns including Newport Beach (4 mi), Santa Ana (5 mi) and Tustin (7 mi).
7 open 24/7 · 13 open weekends · 14 rated 4.5+ · 6 show a license
Data verified October 18, 2026
Luna Quest Services
Blue Systems International
“Send the background and vehicle sighting report same day late night when I asked them to help.”
Quinn & Associates Confidential Investigations
“Quick response, super efficient, goes above and beyond, and truly cares about their work.”
Martin Investigative Services
“I cannot express how thankful for the help provided by Martin Investigative Services to help make my situation better.”
Confidential Controls - Private Investigator
“This report had critical information that helped a legal case I was fighting, and because I got the report so fast, it made me less stressed and relieved.”
The 15 agencies on this page are the private investigators listed for Costa Mesa, 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: Costa Mesa, CA
14 of the 15 agencies on this page have a rating, from 4.6 to 5.0 across 438 reviews; 3 have 50 or more reviews. When clients rate these agencies on specific qualities, they most often praise professionalism (93%), responsiveness (89%) and quality (85%). The topics that come up most in reviews of the agencies on this page are "communication", "expertise" and "price". 7 are open around the clock; 12 are open on Saturdays and 10 on Sundays. 6 show a license on their websites and 1 has a BBB rating of A or A+. 11 have ten or more years of experience, the longest 34 years. 7 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; 14 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 Costa Mesa shown here?
2 of the 15 agencies have an address in Costa Mesa. 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.
Armando Zatarain Investigations
“They have found people that we didn't think could be found and the rates are reasonable.”
JPL Process Service
“Great to work with, fast, responsive, simple, professional.”
DBM Private Investigator
“He's dedicated and took a personal vested interest in resolving the situation at hand and elevating it accordingly.”
Gomez Investigations Unit- Detective Privado
“They are great at what they do and you will always get your money worth no matter the situation.”
Southern California Private Investigations
“Farzin and his team were a pleasure to work with during a very stressful legal case and difficult time.”
Oeis Private Investigation
“Very informative and professional, they were also able to do my live scan after my class ..”
The Covert Consulting Group - Private Investigations
“He reacted quickly and stayed in touch with me at every move; he answered every phone call or message.”
R.H. Young
“There are so many process servers out there, but you don't know if they will just attempt to serve and still be unsuccessful; with Rob we don't have this problem because he is not only diligent but innovative in figuring out how to serve the opposing party.”
C Jackson Investigations
“Cameron saved us a ton of possible future headaches and issues - he does really great work and have suggested him to other business owners and attorneys.”
Why these companies made our list
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