NAICS Code Description

561611 - Investigation Services

*Click to View Top Businesses by Revenue for 561611 – Complete Profiles*.

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

Illustrative Examples:

Fingerprinting services
Private detective services
Polygraph services
Private investigative services


  • Establishments primarily engaged in providing credit checks are classified in Industry 561450, Credit Bureaus.
Index Entries for 561611
561611561611561611Background check services
561611561611561611Bounty hunting services
561611561611561611Detective agencies
561611561611561611Fingerprint services
561611561611561611Investigation services (except credit), private
561611561611561611Investigators, private
561611561611561611Lie detection services
561611561611561611Missing person tracing services
561611561611561611Polygraph services
561611561611561611Private detective services
561611561611561611Private investigation services (except credit)
561611561611561611Skip tracing services

Top Businesses by Annual Sales for 561611 – Click for Complete Profiles:

US Investigations Services LLCIrvineCA
Kroll LLCNew YorkNY
Gw Consulting IncWashingtonDC
Pinkerton Consulting & InvstgtAnn ArborMI
Coventbridge (usa) IncJacksonvilleFL
US Security AssociatesTinley ParkIL
Sdg Global IncSouth HollandIL
Frasco IncBurbankCA
Securatex LtdChicagoIL
Insight Service Group IncDanversMA