Castle Security Group
“Paul Bressler and his team are genuinely good people who know their stuff.”
Best Private Investigators in Baltimore, MD
15 agencies listed · 4 in Baltimore · 6 open 24/7 · 10 open weekends · 12 rated 4.5+
Data verified October 16, 2026
Constable Court Services
“I would definitely recommend Constable Court Services and I look forward to working with the services again as needed.”
Investigative Services of M D
World Wide Investigation
East Coast Investigations
“You've communicated effectively & reassured me of everything that would've taken place.”
Centennial Protection Group
“Centennial has been a great choice.”
The 15 agencies on this page are the private investigators listed for Baltimore, MD. 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: Baltimore, MD
4 of the 15 agencies we list are based in Baltimore; the other 11 serve Baltimore from towns including Towson (6 mi), Linthicum Heights (9 mi) and Parkville (9 mi). 14 of the agencies on this page have a rating, from 4.1 to 5.0 across 147 reviews; 12 are rated 4.5 or higher. 6 are open around the clock; 10 are open on Saturdays and 7 on Sundays. 4 show a license on their websites. 9 have ten or more years of experience, the longest 21 years. 6 offer urgent consultations and 1 lists coupons or special offers. We have a website on file for 12 of the agencies on this page; 9 publish a contact page and 8 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.
Which investigators listed for Baltimore describe their work online?
12 of the 15 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.
Metropolitan Police Protection/Security Services
“I would highly recommend them to everyone, and have actually informed a few of my clients of them personally.”
Prominent Defense Agency
“Chief curbean /assistant chief Morton and captain curry all made me feel comfortable and much like family rather then an employee I highly Recommend any one who looking to become certified either as an unarmed guard/armed guard or if you just need hands on training they are the go 2 guys!!!”
Mwr Investigations
Police Protection Service
“It is very refreshing to see a company have the professionalism to gauge each situation and problem for the customer to have the outcome that they are looking for for the security needs.”
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The Bowden Group & Associates
“This agency is incredible and I'll recommend them to all my family & friends.”
Protection Security Associates
“He is very dedicated to his clients, and I can guarantee you he will always be available to service his clients and his clients' needs first.”
Proof Investigations
Excel Associates
“I've always found Excel to be reliable, efficient, and affordable.”
Alpha Elite Security & Private Investigations
“He worked every angle of the case diligently and stayed in constant contact with me through out the investigation.”
Why these companies made our list
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