Email: DOR_FuelTax@state.co.us
Phone: (303) 205-8205, Option 1
Web Message:
- Send us a secure message through your Revenue Online account.
Hours of Operation:
- 8:00 a.m. to 4:30 p.m. Monday through Friday (except on state holidays)
Mailing Address:
Colorado Department of Revenue
Fuel Tax Unit, Room 200
P.O. Box 17087
Denver, CO 80217-0087