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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