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Lajoie Investigations
“They are always professional, responsive, detailed and provide an excellent product!”
Best Private Investigators near Marlborough, MA
These agencies serve Marlborough from nearby bases in towns including Boston, Woburn and Northborough.
24 agencies listed · 7 open 24/7 · 10 open weekends · 16 rated 4.5+ · 5 show a license
Data verified October 18, 2026
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NSI National Scope Investigations
“NSI has provided excellent services in Texas for me on multiple cases.”
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R&R Consulting and Investigations
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Integrity Claims Investigation
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Professional Investigation Group
“The staff remained in contact with me and provided services above and beyond expectations.”
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Marquet International
The 24 agencies on this page are the private investigators listed for Marlborough, MA. 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: Marlborough, MA
20 of the 24 agencies on this page have a rating, from 4.0 to 5.0 across 172 reviews; 16 are rated 4.5 or higher. When clients rate these agencies on specific qualities, they most often praise professionalism (100%), quality (87%) and responsiveness (87%). 7 are open around the clock; 10 are open on Saturdays and 9 on Sundays. 5 show a license on their websites and 3 have a BBB rating of A or A+. 17 have ten or more years of experience, the longest 46 years. 7 offer urgent consultations; 4 offer a free initial consultation and 2 are family- or locally-owned. We have a website on file for 23 of the agencies on this page; 21 publish a contact page and 17 list a public email. We count these figures across the agencies on this page; hours and prices change, so confirm the details with the agency before you book.
Which investigators listed for Marlborough describe their work online?
23 of the 24 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.
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Shield Investigations
- Efficient
- Service
- Felt
“Very helpful and fast response I called to find a lost brother and they helped me even though I'm on disability they waved the charges and still put the time in for me”
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American Investigative Services
“Great place to hire people to investigate basically anything from missing persons to insurance claims and being sued and to just about everything that can be investigated”
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New England Security & Protective Services Agency
“I needed emergency guard service and with less than 2 hours notice they were able to get 4 guards to my location to assist with watching all my assets.”
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Lyons Investigations
- Team
- Integrity
- Brother
“She serves with the highest level of integrity and professionalism and comes highly recommended by former clients, friends and even attorneys that she works with.”
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MAP Investigations
- Money
- Feelings
- Intelligent
“He is honestly the best person and best private investigator that money can buy…everything about him and his agency is just so excellent, I can't say enough good things about him!!!”
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Kraft Investigations Group
- Efficient
- Team
“My wife and I recently hired Kraft Investigations Group and were very pleased with their work.”
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Dinatale Services
“I highly recommend their services.”
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Claims Bureau USA
“Great company!!”
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Level Investigations
“Our law firm has used Level Investigations many times and always had a great experience working with investigator Dan Collins.”
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Vaglica Investigations
“I was being harassed and threatened almost every single day this year until Jill Vaglica PI found out that I wasn't the only one and that I was dealing with a vexatious litigious person who had me in the crosshairs.”
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Owl Eye Investigations
“I could not have been more satisfied with the service I received from Owl Eye.”
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Nardizzi & Associates
“Thanks for the help from these investigators in Boston, I was able to find out the truth about someone from some old criminal records.”
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The Jones Group
“If you have a legal matter that might require some discreet handling, Fred has the knowledge, experience to know where to look to find information, witnesses and those who may not always want to be found.”
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NWI Investigative Groups
“They are very understanding and patient with new employees.”
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Herb Stacy Investigative Services
“The first time I hired him I had barely any concrete information and an adoption agency that had tried to separate the families, but it didn't take him long at all to get the information I was looking for.”
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RCB and Associates: Private Investigations
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Airde Group
“No complaints at all - team was extremely responsive to my inquiry, quickly understood my needs, and were highly professional in performing the requested services .”
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Metropolitan Protective Service
- Company
“Iwork for this Company”
Private Detective Services in Marlborough, MA Cost Estimates
Minimum cost
$300
Maximum cost
$9500
National Average
$1200
Avg Per Hour Rates
$125
$700
$2000
Typical price range is based on 499 cost profiles
Why these companies made our list
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