NAICS Code 561611 Description

This U.S. industry comprises establishments primarily engaged in providing investigation and detective services.

More Details

NAICS Code 561611 - Investigation Services is a final level code of the “Administrative and Support and Waste Management and Remediation Services” Sector. There are 5,287 companies verified as active in this industry in the USA with an estimated employment of 45,538 people.

Industry Sector

Administrative and Support and Waste Management and Remediation Services

Total Companies


Verified Companies


Est. Employment


Annual Payroll


Total Revenue


SBA Size Standard

Annual Revenue Limit of $22,000,000

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Hierarchy Navigation for NAICS Code 561611

Industry Examples of NAICS 561611

Common types of examples within NAICS Code 561611 - Investigation Services are:

  • 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


For some business types, there may be a similar industry to NAICS Code 561611 - Investigation Services that is a better classification match. Establishments primarily engaged in providing credit checks are classified in NAICS Code - 561450 - Credit Bureaus..

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Industry Executives

Would you like to email executives in NAICS Code 561611 - Investigation Services ? Below are some of the common job titles available to be targeted.

  • Business Development
  • Chairman
  • C-Level
  • Director
  • Engineering
  • Executive Director
  • Facilities
  • Finance
  • Human Resource
  • IT
  • Manager
  • Marketing
  • Manufacturing
  • Operations
  • Owner
  • Partner
  • President
  • Principal
  • Purchasing
  • Sales
  • Vice President

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Questions & Answers

  • What is the SBA NAICS 561611 revenue limit?

    Businesses with an annual revenue under $22,000,000 are considered small businesses by SBA.

  • How many active businesses operate in NAICS Code 561611?

    There are 5,287 verified business locations operating primarily in this industry.

  • What was the total revenue for NAICS Code 561611?

    In 2017 the total revenue for Investigation Services was $5,792,111,000

  • What was the annual payroll for NAICS Code 561611?

    In 2017 the annual payroll for Investigation Services was $2,021,319,000

  • How many people work in NAICS Code 561611?

    The number of reported paid employees is 45,538.