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Browse the Top 10 Private Investigators Serving Illinois

See what 10 private investigators serving Illinois, including Chicago, Collinsville and Downers Grove, offer for personal and business investigations. Read available client feedback, explore business profiles and contact professionals that match your requirements.
Chicago (2)
Collinsville (1)
Downers Grove (1)
Elgin (1)
Freeport (1)
Orland Park (1)
Plainfield (1)
Springfield (1)
Willowbrook (1)
1 review
Stewart & Associates
39 Years
Emergency
1 review
Founded in 1987 with 37 years of security industry expertise
Trusted security solutions provider since 1987, offering 24/7 security services, background checks, and business support across 80+ countries from Freeport, Illinois.
Security Services Background Checks Private Investigations
(815) 235-3807 Call Profile
2 reviews
Heritage Investigations & Surveillance
44 Years
2 reviews
We have over 42 years of experience in private investigations.
Trusted private investigators in Chicago with over 42 years of experience in surveillance, marital infidelity, alimony termination, and child custody cases. Serving the Chicago Metropolitan area.
Marital Infidelity Investigations Alimony Termination Cases Child Custody Surveillance
(312) 987-1828 Call Profile
1 review
Clutter Investigations
1 review
We have over 35 years of experience in criminal defense investigations
Clutter Investigations offers expert criminal defense investigation, DNA testing, and crime scene analysis in Springfield, IL. Board-certified investigators with proven success in wrongful conviction cases.
Criminal Defense Investigation DNA Testing Crime Scene Reconstruction
(217) 528-5997 Call Profile
Not rated yet
VTS Investigations
46 Years
Not rated yet
We have over 40 years of investigative experience in Chicago.
VTS Investigations, LLC offers comprehensive investigative, security, and document services in Chicago since 1980, serving legal, insurance, and corporate clients with discretion and expertise.
Background Checks Asset Searches Litigation Support
(847) 888-4464 Call Profile
Not rated yet
Protek International
21 Years
Emergency
Not rated yet
Founded by former FBI Special Agent and cyber crimes prosecutor
Protek International offers expert digital forensics, eDiscovery, and cyber security services. Securing your edge with honest, simple, and smart solutions in Willowbrook, IL.
Digital Forensics eDiscovery Cyber Security
(630) 986-8204 Call Profile
Not rated yet
Elite Process Serving
23 Years
Emergency
Not rated yet
We have over 20 years of experience in process serving and investigative services.
Elite Process Serving offers fast, professional process serving, skip tracing, and heir searches across all 50 states. Since 2003, we've delivered reliable service with a commitment to excellence.
Service of Process Skip Tracing Heir Searches
(630) 299-4600 Call Profile
Not rated yet
Stealth Investigative
Not rated yet
We offer over 25 years of investigative experience in workers' comp and liability cases.
Trusted private investigation services in Downers Grove, IL. Stealth Investigative offers surveillance, background checks, and accident investigations with 25+ years of expertise.
Surveillance Background Checks Accident Investigation
(630) 810-8909 Call Profile
Not rated yet
Rayburn Fire Scene Investigations
Emergency
Not rated yet
We have 75+ years of combined fire/explosion investigation experience.
Rayburn Fire Scene Investigations provides expert fire and explosion origin analysis with 24-48 hour response times. ISO-accredited, court-approved investigators serving Orland Park, IL and nationwide.
Fire Origin Analysis Explosion Investigation Subrogation Support
(708) 588-1970 Call Profile
Pyr Tech
47 Years
Emergency
Not rated yet
Pyr Tech
47 Years
Emergency
Not rated yet
We offer 44 years of specialized fire investigation expertise
Pyr Tech provides certified fire and explosion investigation services with expertise in origin and cause analysis, evidence retrieval, and consulting for residential and commercial incidents across Illinois, Missouri, and Indiana.
Origin and Cause Investigations Evidence Retrieval Consulting Services
(800) 355-3577 Call Profile
Not rated yet
MSI Detective Services
50+ Years
Emergency
Not rated yet
We offer 24/7 emergency investigative services with immediate response capabilities
Trusted private investigator services in Chicago since 1959. MSI Detective Services offers discreet surveillance, computer forensics, theft investigations, and asset tracking for individuals and businesses.
Surveillance Investigations Computer Forensics Theft Investigations
(773) 404-7400 Call Profile