IRP-Contact Us

  • Call the International Registration Plan phone center at 303-205-5608
  • Fax International Registration Plan at 303-205-5981.

Operating Authority 
Public Utilities Commission 
(303) 894-2000 

Clean Air Act
Motor Vehicle Emissions Section
(303) 205-5603

Commercial Drivers License
Motor Vehicle CDL Section 
(303) 205-5983 

Intelligent Transp. Systems
CDOT
(303) 757-9801

Efficiency Act (*ISTEA)
CDOT
(303) 757-9801

Interstate Registration
Title and Registration Section
(303) 205-5608

Intrastate Registration
Motor Vehicle Registration Section
(303) 205-5608

County Registration Offices
Office Locations

Longer Combination Vehicles
CDOT Extra Legal Permitting 
(303) 757-9539

Unified Carrier Registration (UCR)
Public Utilities Commission
(303) 894-2000

Interstate Fuel Tax Agr. (IFTA)
Fuel Section
(303) 205-8205