Unum Investigations
“His process was also really straightforward and easy and he had no problem providing me with proof of his liability insurance or permits which put me even more at ease.”
Best Private Investigators near Greenwich, CT
2 of these agencies are based in Greenwich; the others serve Greenwich from towns including White Plains, NY (7 mi), Yonkers, NY (15 mi) and Bronx, NY (19 mi).
5 open 24/7 · 16 open weekends · 16 rated 4.5+ · 6 show a license
Data verified October 27, 2026
Greenwich Research
Root Investigations
“The quick response and reasonable guidance on how things are, what to expect and how to position for success has been incredibly valuable while at the same time making me feel a sense of easy going thru the drama.”
DCW Investigations & Security
“This husband and wife dynamic duo of policing and security are phenomenal training unparalleled, great energy,, and truly wants to see you succeed on your journey....”
Asubpoena Service
“Will definitely use them again for jobs in Yonkers.”
Century Protective Services
“With the support of century protective services they make my job very fulfilling to do with the support of a strong team we are able to give our clients the best of services..”
The 24 agencies on this page are the private investigators listed for Greenwich, CT. 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: Greenwich, CT
19 of the 24 agencies on this page have a rating, from 3.9 to 5.0 across 324 reviews; 2 have 50 or more reviews and 16 are rated 4.5 or higher. When clients rate these agencies on specific qualities, they most often praise professionalism (83%), responsiveness (70%) and quality (57%). 5 are open around the clock; 15 are open on Saturdays and 12 on Sundays. The services the agencies on this page list most often on their websites are surveillance (3), background checks (2) and trial preparation (2). 6 show a license on their websites. 16 have ten or more years of experience, the longest 61 years. 5 offer urgent consultations; 2 offer a free initial consultation; 1 is family- or locally-owned and 1 lists coupons or special offers. We have a website on file for 23 of the agencies on this page; 18 publish a contact page and 16 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 Greenwich shown here?
2 of the 24 agencies have an address in Greenwich. 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.
Unique Investigations
“We could never have imagined that someone could have handled and completed our requested services in such a professional and highly skilled manner the way Mr.”
Tmbs Protection Services INC
“A friend of mine referred me to this company after I researched many private investigators I'm glad I chose Tmbs Mr Bradley was on point I didn't know what to expect but he was very patient with me and walk me through this ordeal regarding my stolen...”
Compass Investigators Adjstrs
“I have used Compass Investigators and they did a great job, very professional, reasonable pricing with positive results, I would recommend them to anyone who needs their services.”
Elite Investigations
“I love this company, security is the best choice I made it fit my character, I love the supervisors, and the dispatchers very kind and respectfull, this job is the best I ever had compare to my past history jobs , I love the fact they put me in dif...”
MJS Investigations,llc
“I've been working with MJS Investigations for a while now in terms of process server services, filings, obtaining records, and investigations.”
Terrier Claims Services
Trinity Investigative Group
“He quickly tracked down an individual who owed me money.”
Diligentia Group
“Although, I didn't hire their services I will say they offer very ethical and transparent advice and services.”
Intelex
“Notwithstanding the dearth of information provided, the staff at Intelex utilized numerous resources, including sending a runner/expediter to a Court over a thousand miles away, to retrieve a related but archived probate file from a 1987 estate.”
Professional Intelligence Agency
“Not only the best in the business, but the only one you will ever need.”
Heathcote Investigations
Intrepid Investigations
Professional Investigators
Public Investigation Services
Northern Investigator Services,llc
“The team at Northern Investigator Services conducted a thorough investigation on my behalf and promptly delivered a comprehensive summary of their findings.”
Absolute Private Special Investigations
Safeline Investigation & Security Corp
Shielded Legal and Investigative Services
Why these companies made our list
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