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Colorado Department Of Revenue Fax Number, Mountain Time (MT), Monday through Friday (except on state holidays (opens in new window)). The MIIDB program is codified in Colorado law, CRS §§ 42-7-601 — 42-7-609. Box Taxpayer Identity Verification Taxpayer Security is Our Priority The Colorado Department of Revenue (CDOR) routinely takes precautionary measures to ensure taxpayer refunds are not diverted to identity thieves. Contact Us at the Colorado Department of Motor Vehicles Division of Motor Vehicles 1351 5th St. Answer (1 of 4): All tax returns in Colorado should be mailed to the Colorado Department of Revenue, 1375 Sherman Street, Denver, CO 80261. Apr 1, 2026 ยท Colorado Department of Revenue 1351 5th St. Visit the Refund page to find out how you can check your refund status, no phone call needed! Please add our Taxpayer Services number (303) 238-7378 as a recognized contact in your phone or other electronic device to prevent spam filtering of your scheduled call. The State of Colorado, Department of Revenue/Division of Motor Vehicles (DMV) administers the Motorist Insurance Identification Database (MIIDB) program. Simply scan the barcode on your renewal postcard or type your license plate number on the Last 4 digits of their Social Security Number Full name Date of birth Driver License Number (if available) Complete and legible original signature of driver Photocopy of driver photo ID bearing signature (both sides) Return address and contact phone number/email Appropriate fee Mail to: Department of Revenue Driver Control Section P. When the liability insurance with the SR-22 rider is purchased, the form must be filed with the Colorado Division of Motor Vehicles. fip, d7t4y, c3eeao, wbdn, bv, zp, o1zfj, ee, m0oa, 0b,