ISA Investigations
- Specializes in pre-employment screening, polygraph examinations, and executive protection. Manhattan, New York City.
- http://www.isainvestigations.com/

Incognito Investigations, Inc.
- New York private investigation agency offering services throughout the world.
- http://www.incognitoinvestigations.com/

New England Investigation Security Corp. (NEIS)
- Private investigation services including insurance, MVA's, process service, undercover investigators, and surveillance.
- http://www.neiscorp.com/

Schassler Associates, Inc.
- Offering personal, corporate and industrial services including matrimonial, locating witnesses, missing and abducted persons, background checks, child abuse and nanny watch. Rates provided.
- http://www.newyorkinvestigations.com/

Accurate Information Systems Inc.
- Offers criminal background checks, pre-employment screening, civil history, driving and county records searches. Locations throughout US and 60 other countries. Holtsville, NY, USA
- http://www.accurateinformationsystems.com/

Joe O'Brien
- Emphasizing missing person and witness location, from offices in New York City.
- http://www.obrienxfbi.com/

JL & Associates, Ltd..
- Private investigation firm.
- http://www.jlassoc.com/

Alba Investigations
- specializing in fraud,theft,sexual harassment suits and accident/liability.
- http://www.albainvestigations.com

Alpha Group Investigations
- Investigation-security company serving the corporate community as well as private individuals. Offers on-site investigation as well as data investigations.
- http://www.alphagp.com/

Continental Investigations
- A full service agency in New York and Long Island.
- http://www.confidentialpi.com