National SIU headquarters details
- Street address
- 869 East Schaumburg Road suite 376
- City
- Schaumburg
- State / region
- Illinois
- ZIP / postal code
- 60194
- Country
- United States
- Phone
- +1 800 960 6748
- Founded
- 2004
- Website
- nsiu.com
Location map
Open in Google MapsAll National SIU office locations
| City | State / region | Country | Type |
|---|---|---|---|
| Schaumburg HQ | Illinois | United States | Headquarters |
Showing the headquarters of 4 recorded locations. See every location in GraphIQ →
About National SIU
National SIU is headquartered in Schaumburg, Illinois, United States. Founded in 2004, the company has 4 recorded locations and employs approximately 175 people worldwide.
Where is National SIU's main office?
National SIU's main headquarters office is located at 869 East Schaumburg Road suite 376, Schaumburg, Illinois 60194, United States. This is the company's primary corporate address.
National SIU contact information
The main switchboard for National SIU headquarters can be reached at +1 800 960 6748. Official website: nsiu.com.
What does National SIU do?
Background checks, surveillance, process service, medical records canvass, activity checks, employment checks, statements, social media canvass, asset search, witness statements, infidelity, missing persons, legal services, corporate investigations, FMLA investigations, theft investigations
Frequently asked questions
Where is National SIU headquarters?
National SIU's headquarters is located at 869 East Schaumburg Road suite 376, Schaumburg, Illinois 60194, United States.
How many offices does National SIU have?
GraphIQ records 4 locations for National SIU, as of October 2026.
What is National SIU's corporate address?
The corporate headquarters address is 869 East Schaumburg Road suite 376, Schaumburg, Illinois 60194, United States.
When was National SIU founded?
National SIU was founded in 2004 and employs approximately 175 people.
What is National SIU's phone number?
The main phone number for National SIU headquarters is +1 800 960 6748.
How many employees does National SIU have?
National SIU has approximately 175 employees (GraphIQ estimate, 2026).