NAICS 56161

What is the NAICS code 56161?

The NAICS code 56161 is applied to those industries related to Investigation, Guard, and Armored Car Services.

This industry comprises establishments primarily engaged in providing one or more of the following: (1) investigation, detective, and personal background check services; (2) guard and patrol services; and (3) picking up and delivering money, receipts, or other valuable items with personnel and equipment to protect such properties while in transit.

Illustrative examples:

  • Armored car services
  • Private detective services
  • Bodyguard services
  • Security guard services
  • Polygraph services

Therefore, all companies engaged in any industrial activity related to this type of business are grouped under category 56161 in the North American Industry Classification System.

This industrial activity of NAICS code is structured as follows:

Characteristics of the North American Industry Classification System code 56161


This NAICS code is used in the trilateral agreement of the three members of the North American Free Trade Agreement (NAFTA): United States, Canada, and Mexico.

Related codes

The NAICS industry 56161 has the following cross-references:

  • Establishments primarily engaged in providing credit checks are classified in Industry 56145, Credit Bureaus.
  • Establishments primarily engaged in selling, installing, monitoring, and maintaining security systems and devices (e.g., burglar and fire alarm systems) are classified in Industry 56162, Security Systems Services.
  • Government establishments primarily engaged in criminal and civil law enforcement, police, traffic safety, and similar activities related to the enforcement of law are classified in Industry 92212, Police Protection.

Related activities

Below are some of the most common types of activities in the Investigation, Guard, and Armored Car Services industry (NAICS Code 56161).

  • Background check services
  • Bounty hunting services
  • Detective agencies
  • Fingerprint services
  • Investigation services (except credit), private
  • Investigators, private
  • Lie detection services
  • Missing person tracing services
  • Polygraph services
  • Private detective services
  • Private investigation services (except credit)
  • Skip tracing services

NAICS 56161

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