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Request can be made through your Revenue Online account by submitting a web message to the Department. You can also request additional decals by faxing the request to 303-205-8215, mailing the request to the Colorado Department of Revenue, Room 200 P.O. Box 17087 Denver, CO 80217, calling the Fuel Tax Unit at 303-205-8205, or by making the request in person at a service center. A copy of the cab card registration for the vehicle(s) is required.