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Contact Us

Main Contact Information - Headquarters

U.S. Department of the Interior
Office of Inspector General
1849 C Street NW - Mail Stop 4428
Washington, D.C. 20240

Phone: 202-208-5745
Fax: 202-219-3856

Hotline

Learn more about contacting the OIG Hotline.

  • Toll Free: 800-424-5081
  • Eastern Regional Office - Herndon, VA: 703-487-8035
  • Central Regional Office - Lakewood, CO: 303-236-8296

Audits Phone
916-978-6199

Audits Fax
916-978-5656

Investigations Phone
916-978-5630

Investigations Fax
916-978-5635

Audits Phone
303-236-9243

Audits Fax
303-236-8211

Investigations Phone
303-236-9243

Investigations Fax
303-236-8279

Main Phone
770-801-7920

Main Fax
770-801-7924

Phone
800-424-5081

Main Phone
505-816-1020

Audits Fax
703-487-8055

Investigations Fax
703-487-8072

OIG Hotline Poster

Download, print, and share the OIG Hotline poster to increase awareness of how to deter, detect, and disclose fraud, waste, abuse, and mismanagement.

Information Quality

Questions, Feedback, or Report Notifications

The Office of Inspector General offers report notification emails and welcomes any inquiries or suggestions by contacting the Webmaster