How To Hire An Investigator
Another great website with great advice on deciding which private investigation service is right for you. Again, we invite you to compare the author's advice with what we do for you at ICS... we're positive you'll find we match up very favorably!

The below are excerpt from http://www.census.com/

SIC Code

7381 DETECTIVE AND ARMORED CAR SERVICES
7381 SECURITY GUARD AND PATROL SERVICES
7381 PRIVATE INVESTIGATOR
7381 INVESTIGATION SERVICES EXCEPT CREDIT - PRIVATE
7381 INVESTIGATION SERVICES
7381 SECURITY GUARD SERVICE

NAICS

Code U.S. NAICS Title
Investigation and Security Services 5616 Investigation and Security Services
Investigation services (except credit), private 561611 Investigation Services
Investigation services, credit 561450 Credit Bureaus

http://www.census.gov/epcd/naics/NDEF561.HTM#N5616

5616 Investigation and Security Services

56161 Investigation, Guard, and Armored Car Services

This industry comprises establishments primarily engaged in providing one or more of the following: (1) investigation and detective 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.

561611 Investigation Services

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

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1997 Economic Census Bridge Between NAICS and SIC NAICS Manual Table 1
NAICS SIC Corresponding Index Entries
561611 7381 Detective agencies
561611 7381 Fingerprint services
561611 7381 Investigation services (except credit), private
561611 7381 Investigators, private
561611 7381 Lie detection services
561611 7381 Missing person tracing services
561611 7381 Polygraph services
561611 7381 Private detective services
561611 7381 Private investigation services (except credit)
561611 7381 Skip tracing services