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Best Private Investigators in Baltimore, MD

Our Recommended Top 8

We did the research for you!

  • Licensing
  • User Reviews
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Our goal is to connect people with the best local professionals. We scored Baltimore Private Investigators on more than 25 variables across five categories, and analyzed the results to give you a hand-picked list of the best.



8Top Picks

Learn about our selection process.


featured provider = Featured Provider

Millersville, MD 21108 Rating

Why choose this provider?

AAA Surveillance, Inc. is a private investigation firm in Millersville. The agency is licensed by the state to perform undercover surveillance by legally following people and document activities using a video camera. The company provides surveillance services for a range of cases, including adultery, child custody, insurance fraud, and alcohol and drug abuse. AAA Surveillance, Inc. allows clients to pay as the case proceeds rather than post a large retainer, and investigators keep clients updated every step of the process.

7596 Ritchie Hwy #7,, Glen Burnie, WA 21061 Rating

Review Sources

4.6 (35)
5.0 (1)

Why choose this provider?

East Coast Investigators Inc. is a private investigation agency that's located in Baltimore DC. It's been in business for over a decade and offers a broad range of investigative services throughout the State of Maryland. The agency's investigators work on criminal, domestic, surveillance, and internal cases. East Coast Investigators Inc. also offers background checks and security services, as well as process and location services. The company offers a variety of payment options for the convenience of its clients.

Baltimore, MD 21236 Rating

Review Sources

5.0 (1)

Why choose this provider?

Protection Security Associates is a professional security and investigative services company in Baltimore. The company provides executive protection, event security, and contract security guards for clients that include the National Football League and the National Security Agency. The company’s private investigation staff includes former law enforcement and military members. Protection Security Associates completes background checks and performs investigations for attorneys, insurance companies, and other clients.

Sykesville, MD 21784

Why choose this provider?

Aris Investigations in Sykesville has more than 35 years of experience as a private investigation firm in the Baltimore area. The agency provides services for all manner of clients, including individuals, law firms, insurance companies, and government agencies. Aris Investigations handles a range of cases, including criminal and civil investigations, process service, and asset verification. The company also provides background checks for pre-employment screening and searches for missing persons.

Baltimore, MD 21227 Rating

Review Sources

5.0 (1)

Why choose this provider?

Commercial Index Bureau is a private investigation firm that opened in 1967 and has its headquarters in Baltimore, Jacksonville, and Philadelphia. The agency partners with vendors across the country to provide nationwide surveillance services. The company’s eDossier provides a comprehensive background check that includes a Social Security number trace, address verification, and local, state, and national court records checks. The company also performs field investigations, unmanned drone surveillance, and activity checks.

Timonium, MD 21093 Rating

Why choose this provider?

Comprehensive Investigations, Inc. is a private detective firm that opened in Timonium almost a decade ago. The agency specializes in conducting insurance fraud investigations for workers’ compensation and personal injury cases. The firm’s five investigators perform surveillance of claimants and provide photographic evidence of their daily activities and physical capabilities. The company uses a specially designed vehicle equipped with digital video cameras and lenses on its surveillance assignments.

Towson, MD 21286 Rating

Review Sources

4.4 (193)
3.5 (8)

Why choose this provider?

Absolute Investigative and Security Services provides private investigative services in the Baltimore area from offices in Towson, Bel Air, and Berlin. Owner Reginald Przybylski is a retired detective lieutenant after 23 years with the Baltimore County Police Department. All company staffers are retired police officers, detectives, police command personnel, and supervisory and management personnel from the private sector. Absolute Investigative and Security Services is licensed throughout Maryland to provide background investigations, polygraph testing, records research, and a host of other investigative services.

Columbia, MD 21045 Rating

Review Sources

5.0 (2)

Why choose this provider?

Titan Investigative Alliance is a private investigation firm with its corporate offices in Columbia. The company specializes in investigating insurance claims, including workers’ compensation, property and casualty, life and health insurance, and auto accidents. Its investigative services include surveillance, compliance reporting, social network and Internet monitoring, and background checks.

Compare our Top Private Investigators

NameExpertise RatingAddressPromotionsLearn more
AAA Surveillance, Inc.
Millersville, MD 21108
East Coast Investigations, Inc.
7596 Ritchie Hwy #7,, Glen Burnie, WA 21061
Protection Security Associates
Baltimore, MD 21236
Aris Investigations
Sykesville, MD 21784
Commercial Index Bureau
Baltimore, MD 21227
Comprehensive Investigations, Inc.
Timonium, MD 21093
Absolute Investigative and Security Services
Towson, MD 21286
Columbia, MD 21045


  • Introduction

    Some cases grow cold without ever getting solved by the police, and others tend to be too unorthodox for the police since they're mainly limited to criminal cases. This is where private investigators come in.

    Private investigators, also known as PIs, offer a wide range of services, including finding missing persons, tracking marital infidelity, investigating theft, running background checks, verifying insurance claims, and collecting debts on behalf of their clients.

    PIs work on any case requiring extensive research and investigation. Their duties range from gathering vital facts and connecting clues to providing conclusive information regarding the case.
  • What is a private investigator?

    Private investigators are experienced individuals hired to carry out detective work. They are fact-finding experts who dedicate time and effort to gather evidence and reveal information that would be difficult to gain through ordinary means. Private investigators can either operate alone or work for an agency.

  • Are private detectives real?

    Yes, private investigators are real. They provide their expertise to anyone who needs an in-depth investigation for an important matter. Whether tracking a long-lost loved one, running background checks, finding missing persons, or conducting general research, private detectives operate with discretion and rarely make the news.

  • What do private investigators do?

    PI work involves a lot of information gathering and fact analysis. Their field assignments involve carefully following persons of interest, conducting surveillance, interviewing people, and, sometimes, going undercover to get more information. They use GPS tracking devices, video recorders, computers, and other technology to collect information.

  • How do private investigators work?

    Private investigators’ ability to conduct examinations and close cases without their targets knowing their involvement makes them very effective. A PI firm may have different personnel, each specializing in a particular field. From computer experts to web-data analysts and field officers, these agents work together to solve cases or complete an objective.

  • What is a private investigator allowed to do?

    PIs are civilians, so they're required to operate within the confines of the law. Private investigators search multiple online databases, public records, and open source files to collect information. However, they cannot bug phones or hack into online accounts to acquire protected information. They can conduct surveillance on people in public places, but they can't trespass into their homes or property.