Boulder County government offices are closed Wednesday, June 19, in observance of Juneteenth. Primary Elections Vote Center locations are open.

Appointments now required for in-person visits. Additionally, registration renewals need to be completed out of office. Options include online, by mail or drop box, or at a self-service kiosk. Read about these changes (including benefits, and FAQs). Información en español.


Camper trailer being towed by pickup truck

Colorado law requires that all trailers be titled, registered and plated. To complete this process for the first time bring the following:

  • Secure and Verifiable ID
  • Colorado title (NOTE: see below if the trailer has documents from a state other than Colorado)*
  • Paperwork if purchased from a Colorado dealer

*Trailers with documents from another state

Contact the office for information on titling and registering a trailer from out of state or a trailer purchased from an out-of-state dealer:

Homemade & Kit Trailers

Applying for a trailer identification number for a homemade or kit trailer will require a Certified VIN Inspection by the State Highway Patrol in addition to providing the following documents and information as described below:

Trailer hauler

  • Length
  • Width
  • Weight
  • Value
  • Type of trailer
  • Receipts (for the kit or if parts or supplies were purchased to build the trailer)
  • The owner or builder must sign an affidavit listing the trailer’s dimensions and stating how the trailer was put together

After this process is completed an identification number on a metal plate will be assigned for the trailer and must be attached to the front, right corner of the frame or nearest metal part.

Contact Us

Motor Vehicle Division

7:30 a.m. to 5 p.m.
Closed Fridays
Online Motor Vehicle Contact Us Form
Contáctenos - Formulario en línea

Phone: 303-413-7710
Fax: 303-413-7706


Boulder: 1750 33rd St.
Map and Directions Boulder Location

Longmont: 529 Coffman St.
Map and Directions Longmont Location

Lafayette: 1755 S. Public Road
Map and Directions Lafayette Location

Mailing Address

1750 33rd St., Suite 100
Boulder, CO 80301