Best Private Investigators in Chicago, IL

24 agencies listed · all 24 in Chicago · 9 open 24/7 · 14 open weekends · 20 rated 4.5+

Data verified October 18, 2026

Northshore Process Service Network

Northshore Process Service Network

(37)
  • Future
  • Efficient
  • Defendant
“I have been using them since before COVID and their professionalism, attention to detail, customer service, employees, timeliness, and services are leaps and bounds better than ANY other process server I've used or heard of.”
Emergency Services
In Business Since 1998
BBB Rating: A+
208 W Washington St APT 806, Chicago, IL
i
Williams & Nickl

Williams & Nickl

(48)
  • Regulations
  • RN
  • Experts
“These guys are amazing I definitely recommend these guys if your trying to get your foid card they walk you through step-by-step until the process is completed..”
11+ Years Experience
1720 W Division St 2nd Floor, Chicago, IL
i
On Q Professional Investigations

On Q Professional Investigations

(49)
  • CCW
  • Training
  • Informative
“Thank God for this instructor and his staff that really cares about the instruction of this type of work, the best place to learn, 5 star plus, also the Best instructor that i have encounter in my career.”
In Business Since 2013
Accepts All Major Credit Cards
3004 W Belmont Ave #1b, Chicago, IL
i
RA Private Investigation & Security

RA Private Investigation & Security

(18)
  • Company
  • Team
  • Money
“He was extremely professional, courteous and knowledgeable, I'm extremely thankful for all he did for our family, I would consider RA investigating services as a very professional company and through, Thank you Jordan”
In Business Since 2020
Free Initial Consultation
2935 S Halsted St, Chicago, IL
i
PCI Investigations

PCI Investigations

(4)
“Really helped me when I needed it the most!!”
Free Initial Consultation
In Business Since 2020
Emergency Services
444 N Michigan Ave #1200, Chicago, IL
i
Chicago Executive Protection - Secure Options Consulting

Chicago Executive Protection - Secure Options Consulting

(4)
  • Company
  • Team
  • Premises
“Beyond their impressive credentials, their adaptability to our ever-evolving daily challenges, from having guards arrive ahead of schedule to staying late for unforeseen events, has been commendable.”
Emergency Services
In Business Since 2011
Licensed
River Point, 444 W Lake St 17th floor, Chicago, IL
i

The 24 agencies on this page are the private investigators listed for Chicago, IL. What each one states about its license, its specialties and the areas it covers comes from its own website; ratings and quotes come from public reviews.

Area overview: Chicago, IL

All 24 agencies we list here are in Chicago itself. We have 46 agencies in Chicago on file; this page shows the highest-rated 24. The agencies on this page are rated from 3.9 to 5.0 across 660 reviews; 3 have 50 or more reviews and 20 are rated 4.5 or higher. 9 are open around the clock; 14 are open on Saturdays and 12 on Sundays. 12 show a license on their websites and 2 have a BBB rating of A or A+. Domain records put 20 websites of the agencies on this page at ten or more years old; the oldest dates from 1998. 9 offer urgent consultations and 7 offer a free initial consultation. We have a website on file for all 24 of the agencies on this page; 21 publish a contact page; 17 list a public email and 1 takes bookings online. We count these figures across the agencies on this page; hours and prices change, so confirm the details with the agency before you book.

Do investigators listed for Chicago discuss a case free?

7 of the 24 agencies state that a first consultation costs nothing. Use it to describe the problem and hear whether the work can be done lawfully at all. A straight agency will sometimes tell you on that call that what you want cannot be obtained, which saves you a retainer.

Lawdog Security & Investigations

Lawdog Security & Investigations

(34)
  • Team
  • Supervisor
  • Needs
“Working as a security guard for Law Dog gave me lots of opportunities to manage how I would like to work because you can choose to work more in a day by requesting it.”
Emergency Services
Accepts All Major Credit Cards
In Business Since 2015
Licensed
10359 S Pulaski Rd, Chicago, IL
i
U.S. Security and Protective Services

U.S. Security and Protective Services

(3)
“Very professional place well structured i recommend them for their services!!!!”
In Business Since 2012
Emergency Services
2445 W Schubert Ave, Chicago, IL
i
Citywide Security Group

Citywide Security Group

(1)
“Because I work there”
In Business Since 2007
Emergency Services
3320 W Foster Ave # 258, Chicago, IL
i
Key Chicago Private Investigators

Key Chicago Private Investigators

(1)
“Jeanne was very thoughtful in her preliminary questioning and then did a great job setting up a strategic plan of action; with excellent follow-through and timely updates.”
In Business Since 2021
Licensed
25 E Delaware Pl, Chicago, IL
i
International Protective Services

International Protective Services

“INTERNATIONAL PROTECTIVE SERVICES INC. Our Experienced and Highly-Qualified Team are Certified to Provide Basic Security Training, Armed Training, or Concealed Carry Training”
In Business Since 2010
Emergency Services
5901 N Cicero Ave #504, Chicago, IL
i
Usia Private Security

Usia Private Security

(1)
“Excellent service.”
Free Initial Consultation
Emergency Services
In Business Since 2010
Licensed
401 N Michigan Ave Suite 1200, Chicago, IL
i
Myers Service

Myers Service

(3)
“Hard working, diligent and thorough.”
In Business Since 1998
Licensed
2406 W Fullerton Ave, Chicago, IL
i
Courthouse Courier

Courthouse Courier

(6)
“Excellent information and feedback.”
In Business Since 2002
Licensed
1658 N Milwaukee Ave, Chicago, IL
i
Heritage Investigations & Surveillance

Heritage Investigations & Surveillance

(2)
“I have worked with Adam Campbell over the last 34 years on complex personal injury and criminal cases and have never been disappointed by the quality of service and integrity of him and his company.”
Free Initial Consultation
42+ Years Experience
Licensed
123 W Madison St, Chicago, IL
i
RGH Investigations - Chicago Private Investigator

RGH Investigations - Chicago Private Investigator

(1)
“From interviewing witnesses to getting documents, police reports, medical records, (and anything else), Bob always comes through very quickly.”
In Business Since 2011
Emergency Services
505 E Illinois St, Chicago, IL
i
Vantius

Vantius

(5)
“They did an excellent job of providing a great work product in a time sensitive manner.”
In Business Since 2005
Accepts All Major Credit Cards
980 N Michigan Ave, Chicago, IL
i
Ingenium Consulting Group

Ingenium Consulting Group

(1)
“Called Ingenium the took care of all the problems.”
Free Initial Consultation
In Business Since 2015
Licensed
Aon Center, 200 E Randolph St Ste 5100, Chicago, IL
i
Law Offices of Tracy M. Rizzo

Law Offices of Tracy M. Rizzo

(4)
“So, without going into my divorce saga (which after 2 years finally ended this week), I need to praise my intelligent, ethical, strategic, fair, honest, humble, and kind pitbull lawyer Tracy Rizzo.”
In Business Since 2001
30 N La Salle St #2340, Chicago, IL
i
Omega Global Security

Omega Global Security

“Omega Global is your professional security and investigations firm in the state of Illinois. We maintain the highest standards and take pride in providing a level of service that will exceed your expectations, utilizing our team of trained, licensed ...”
Free Initial Consultation
In Business Since 2013
Licensed
423 E 87th Pl, Chicago, IL
i
Axium Consulting

Axium Consulting

“Axium's seasoned and multidisciplinary team of experienced investigators, former law enforcement agents and journalists, forensic accountants, intelligence analysts, certified fraud examiners, and lawyers provides focused investigative and intelligen...”
In Business Since 2008
Licensed
120 N La Salle St #2000, Chicago, IL
i
Legal Eye

Legal Eye

(1)
“LEGAL EYE's Chicago Office manages statewide investigations as well as provides oversight and management to several other major cities in the midwest.”
Free Initial Consultation
In Business Since 2020
Licensed
Chicago, IL
i
Todd Martinson

Todd Martinson

(1)
“Extremely competent, reliable and reasonably priced”
In Business Since 2007
10 South LaSalle, 10 S La Salle St STE 1230, Chicago, IL
i
National Protection & Investigation Agency

National Protection & Investigation Agency

“NPIA tailors its serves to meet the needs of each client. While we naturally have basic services that are provided, we do not believe that those services can be applied in a "one size fits all" manner. With this in mind, we engage in a complementary ...”
In Business Since 2014
Licensed
120 S State St #218, Chicago, IL
i

Private Detective Services in Chicago, IL Cost Estimates

Minimum cost
$375
Maximum cost
$11871
National Average
$1500
Avg Per Hour Rates
$157
$875
$2499
Typical price range is based on 517 cost profiles
Click to copy
Successfully copied!
Average Cost $1500
Minimum cost $375
Maximum cost $11871
Avg Per Hour Rates $157

Typical range $875 to $2499 is based on 517 cost profiles.

Why these companies made our list

Is this page useful? Yes
No
Is there anything wrong with this page?
Back To Top