To renew your vehicle registration by mail, please send the following to Motor Vehicle Division, 1750 33rd Street, Suite 100, Boulder, CO 80301:
- Postcard renewal notice
- Proof of insurance if it is noted on your postcard renewal notice
- All motor vehicle types must have insurance to be driven on Colorado highways
- Your new physical and mailing addresses if they have changed
- Proof of emissions if it is noted on your postcard renewal notice
- Payment by check, payable to Boulder County Clerk, for the amount shown on your renewal postcard
Important Note: Renewals must be received by the last day of the grace period (one month after the expiration month).