Colorado Department of Revenue Office Address 2026 Direct
A direct address guide for people searching “Colorado Department of Revenue address.” Use this page to quickly identify the correct Denver office address, Taxation mailing address, Revenue Online path, taxpayer service phone number, payment address warning, DMV confusion, appointment rules and which Colorado DOR division you actually need.
Quick Answer: Colorado Department of Revenue Address in 2026
The main Colorado Department of Revenue taxpayer service address most people need for in-person tax help is 1351 5th St., Suite 100, Denver, CO 80204. This is the Denver Regional Service Center / Denver Metro taxpayer service location. For mail, do not automatically use the street address: Colorado DOR uses different mailing addresses and ZIP+4 codes depending on whether you are sending a return, payment, protest, letter, sales tax item, withholding item, fee return or other business tax item.
For in-person tax help
Start with the taxpayer service center page. Denver Metro is listed at 1351 5th St., Suite 100, Denver, CO 80204 and is shown as appointment-only.
For letters and protests
Colorado DOR lists P.O. Box 17087, Denver, CO 80217-0087 for many letters, protests and correspondence routing. Some tax types use special ZIP+4 codes.
For DMV matters
Driver license, vehicle registration, title and plate questions generally belong to Colorado DMV or county motor vehicle offices, not the regular tax service center.
Colorado Department of Revenue Direct Office Address Table
Use this direct table first. It separates the walk-in service address from tax mailing addresses and division-specific routes.
| Need | Direct address / official route | Important note |
|---|---|---|
| Denver Metro Taxpayer Service Center | 1351 5th St., Suite 100, Denver, CO 80204 | Use for taxpayer service center visit planning. The Denver location is listed as appointment-only. |
| Denver Regional Service Center hours | Monday–Friday, 8:00 a.m.–5:00 p.m.; closed on recognized state holidays. | Check the official visit page before going because appointment and closure rules can change. |
| Taxpayer Helpline | 303-238-7378 | Taxpayer Service Representatives are generally available Monday–Friday, 8:00 a.m.–4:30 p.m. MT, except state holidays. |
| General letters and protests by USPS | Colorado Department of Revenue, Section or Employee Name and Room Number, P.O. Box 17087, Denver, CO 80217-0087 | Use official mailing instructions from the form or notice. Include section/employee name if provided. |
| Tax payments / return mail | Often uses Colorado Department of Revenue, Denver, CO 80261 plus a specific ZIP+4. | Street address may not be required for certain DOR payment ZIP codes. Use the exact ZIP+4 on the official form. |
| Express mail for some tax units | Colorado Department of Revenue, unit name, 2829 W. Howard Pl., Denver, CO 80204 | Only use when the official unit/contact page or notice says express delivery should go there. |
| Executive Director’s Office | Use official CDOR Executive Director contact page; phone shown as 303-866-4622. | Not the right path for routine tax refund, payment, return, DMV or sales tax questions. |
| DMV services | Use Colorado DMV online services or local county office. | The tax address is not automatically the right address for driver license or vehicle registration issues. |
Colorado Department of Revenue Denver Office Map: 1351 5th St., Suite 100
The embedded map below points to the Denver Metro taxpayer service location address. Check official appointment rules before traveling.
Before using the map
- Confirm whether your issue is Taxation, DMV, Hearings, Collections, Lottery, Gaming, Liquor, Marijuana, Natural Medicine or another CDOR division.
- Check whether an appointment is required for the Denver taxpayer service center.
- Bring the notice, account number, tax year, tax type and payment confirmation if applicable.
- Do not mail tax payments to the map address unless the official form or notice says to use that address.
Parking and transit reminder
Parking, transit access and building entry procedures can change. Use the official Denver Regional Service Center page or directions page before leaving, especially during weather events, holidays or high-volume filing season.
Colorado Department of Revenue Mailing Address: Letters, Payments, Returns and Protests
Colorado DOR mailing addresses are not one-size-fits-all. A taxpayer may need a P.O. Box, a Denver 80261 payment ZIP+4, a unit-specific address, or an express delivery address depending on the form, notice and tax type.
| Mailing situation | Common official routing | What to verify before mailing |
|---|---|---|
| Letters and protests | Colorado Department of Revenue, Section or Employee Name and Room Number, P.O. Box 17087, Denver, CO 80217-0087 | Include section name, employee name, room number or letter ID if the notice provides one. |
| Notice of deficiency, protests or delinquent tax payments | Colorado DOR mail guidance lists ZIP+4 routing including 80261-0004 for certain deficiency/protest/delinquent items. | Match your notice and tax type before using the ZIP+4. |
| Withholding tax and miscellaneous business taxes | Colorado DOR mail guidance lists 80261-0009 for withholding and miscellaneous business tax routing. | Use the exact form instruction for annual withholding reconciliation or business-tax item. |
| Sales tax, use tax, lodging and related local taxes | Colorado DOR mail guidance lists 80261-0013 for sales/use and several related tax categories. | Confirm the tax type, period and account number before mailing. |
| Individual income tax payment form | Some individual payment forms instruct mailing to Colorado Department of Revenue, Denver, CO 80261 with a specific ZIP+4. | Use the current-year DR form instructions. Do not guess a ZIP+4 from an old return. |
| Address change / taxpayer service center mail | Colorado Department of Revenue, Taxpayer Service Center, P.O. Box 17087, Denver, CO 80217-0087 | Include Colorado Account Number, effective date, name and contact information when applicable. |
| Express mail delivery | Some units list Colorado Department of Revenue, unit name, 2829 W. Howard Pl., Denver, CO 80204. | Only use an express address when the unit page, form or notice specifically gives that delivery route. |
Colorado DOR Address Helper: Which Address or Office Do You Need?
Choose your situation and this helper will point you to the safest official route. It does not collect personal data.
Select what you need. The helper will show the official route, what to prepare and the address mistake to avoid.
Colorado Taxpayer Service Centers: Denver, Colorado Springs and TAX2GO
Colorado DOR’s Taxation Division offers taxpayer service center information online. The Denver Metro office is listed at 1351 5th St., Suite 100, Denver, CO 80204 by appointment only. The service center page also lists a Colorado Springs location at 2447 North Union Blvd., Colorado Springs, CO 80909 and promotes TAX2GO mobile service options.
| Location / service | Address / route | Best use |
|---|---|---|
| Denver Metro taxpayer service | 1351 5th St., Suite 100, Denver, CO 80204 | General taxpayer service center help; check appointment rules first. |
| Denver Regional Service Center | 1351 5th St., Suite 100, Denver, CO 80204 | Official page lists Monday–Friday 8:00 a.m.–5:00 p.m., closed on recognized state holidays. |
| Colorado Springs taxpayer service | 2447 North Union Blvd., Colorado Springs, CO 80909 | Use the official service center page for current availability and directions. |
| TAX2GO | Mobile service information on the official service center page. | Useful when you cannot easily visit a listed taxpayer service center. |
Colorado DOR Division Address Confusion: Taxation vs DMV vs Gaming vs Liquor
The Colorado Department of Revenue is bigger than the Taxation Division. The official CDOR homepage describes the Department as the state agency for Taxation, DMV, Gaming, Liquor Enforcement, Lottery, Marijuana, Natural Medicine and other division services. The address you need depends on the division.
Use Taxation Division for
- Individual income tax.
- Business income tax.
- Sales and use tax.
- Withholding tax.
- Revenue Online.
- Tax refund status.
- Tax notices, collections and payment routing.
Use another CDOR division or office for
- Driver license and state ID questions.
- Vehicle title, plates and registration.
- Liquor licensing or enforcement.
- Gaming licensing and enforcement.
- Colorado Lottery questions.
- Marijuana or natural medicine licensing topics.
- Hearings division matters.
Colorado Tax Address Guide: Revenue Online, Refunds, Sales Tax, Withholding and Collections
Not every tax issue needs an office visit or paper mailing. Colorado DOR provides Revenue Online for state tax account management, SUTS for state-administered and home-rule sales/use tax filing, refund status tools and department phone support.
| Tax issue | Best official route | What to prepare |
|---|---|---|
| State income tax account | Revenue Online or Taxation contact page. | SSN/ITIN, tax year, return type, notice letter ID and payment/refund details. |
| Colorado refund status | Where’s My Refund / Revenue Online status tools. | Tax year, identifying information and expected refund amount. |
| Sales and use tax filing | SUTS or Revenue Online depending on filing situation. | Colorado Account Number, filing period, jurisdiction/rate, receipts and payment information. |
| Sales tax rate by address | Colorado GIS / sales tax lookup tools. | Exact address, delivery location, jurisdiction and transaction date. |
| Withholding tax | Revenue Online, business tax pages or official withholding forms. | Colorado Account Number, FEIN, filing period, payroll records and reconciliation details. |
| Collections issue | Collections phone 303-205-8291 or official Collections page. | Notice, tax type, account number, payment proof and deadline. |
Colorado DMV Address Help: When the DOR Address Is Not Enough
Colorado DMV is part of the Colorado Department of Revenue, but DMV services are not the same as tax services. Driver license renewals, state IDs, vehicle title, registration, plates, emissions and insurance matters usually require DMV online services or county motor vehicle offices.
Use DMV for
- Driver license or ID renewal.
- Vehicle registration renewal.
- Title, plates, tabs and registration issues.
- Insurance verification or DMV letters.
- Driving record or license status questions.
- County motor vehicle office lookup.
Address mistake to avoid
Do not mail or bring driver license, title or vehicle registration paperwork to the tax service center unless an official DMV notice specifically instructs you to do so. Start with Colorado DMV or your county motor vehicle office.
Colorado DOR Notice Address: Where To Send a Response, Protest or Payment
If you received a Colorado DOR letter, the correct address is usually the one printed on the notice. The notice can involve tax return review, a balance due, delinquency, deficiency, collections, refund adjustment, missing return, business account update or identity verification.
| Notice type | First address check | What to include |
|---|---|---|
| Notice of deficiency | Use the address and ZIP+4 from the notice or official mail page. | Letter ID, tax year, tax type, signed protest/response and supporting documents. |
| Collections notice | Collections page lists mailing address as Colorado Department of Revenue, Attn: Collections, P.O. Box 17087, Denver, CO 80217-0087. | Account number, notice, payment proof, deadline and contact information. |
| Sales or use tax notice | Check whether the notice requires SUTS, Revenue Online, mail response or phone contact. | Colorado Account Number, sales period, jurisdiction, rate support and return confirmation. |
| Withholding notice | Check withholding account route and annual reconciliation instructions. | FEIN, Colorado Account Number, payroll period, W-2/1099 records and payment proof. |
| Address or business site change | Taxpayer Service Center, P.O. Box 17087, Denver, CO 80217-0087 may apply for certain address-change mail. | 12-digit Colorado Account Number, location address change effective date, name and contact information. |
Colorado Department of Revenue Phone Numbers and Contact Paths
Calling first can prevent a wrong office visit or wrong mailing address. Use the official phone path for the division and issue type.
| Need | Official contact | What to prepare |
|---|---|---|
| Taxpayer Helpline | 303-238-7378 | SSN/ITIN or Colorado Account Number, tax year, tax type, letter ID and issue summary. |
| Taxpayer service phone hours | Monday–Friday, 8:00 a.m.–4:30 p.m. MT, except state holidays. | Call outside peak times when possible and use official callback scheduling if available. |
| Collections | 303-205-8291 | Notice, account number, balance due, payment records and deadline. |
| Hearings Division | 303-205-5606 | Hearing notice, case details, Zoom information and deadline. |
| Executive Director’s Office | 303-866-4622 | Use for executive office inquiries, not routine tax refund or DMV issues. |
| Human Resources | 303-866-3716 | Use for CDOR employment or HR matters, not tax account help. |
| DMV | Use official DMV contact pages or myDMV. | Driver license, vehicle title, registration, plate or county office details. |
Colorado DOR Office Visit Checklist: What To Bring Before You Go
Use this checklist before visiting the Denver or Colorado Springs taxpayer service center. It helps avoid a second trip.
Bring these documents
- Photo ID if identity or account access is involved.
- Tax notice, letter ID, bill or correspondence.
- Federal and Colorado return copies for the tax year involved.
- Payment confirmations, bank records or check copies.
- Colorado Account Number for business tax accounts.
- FEIN, SSN/ITIN or other identifying information as appropriate.
- Power of attorney or authorization if representing another taxpayer.
Confirm before traveling
- Appointment requirement for the service center.
- Current office hours and state holiday closures.
- Whether your issue belongs to Taxation or DMV.
- Whether your issue can be solved faster through Revenue Online.
- Whether the notice gives a special phone number or mailing address.
- Whether the service center accepts the document or payment type you have.
Colorado Department of Revenue Address FAQs
Visible FAQs below match the FAQPage schema included at the end of this article.
What is the Colorado Department of Revenue Denver office address?
The Denver Metro taxpayer service center address is 1351 5th St., Suite 100, Denver, CO 80204.
Is the Denver Colorado DOR office appointment-only?
The official taxpayer service center page lists the Denver Metro location at 1351 5th St., Suite 100 as appointment-only. Check the official page before visiting.
What are the Denver Regional Service Center hours?
The Denver Regional Service Center page lists Monday through Friday, 8:00 a.m. to 5:00 p.m., closed on recognized state holidays.
What is the Colorado Department of Revenue mailing address for letters?
For many letters and protests, Colorado DOR lists P.O. Box 17087, Denver, CO 80217-0087, with section or employee name and room number when applicable.
Should I mail Colorado tax payments to 1351 5th St.?
Usually no. Many Colorado tax returns and payments use special Denver 80261 ZIP+4 routing. Use the exact address on the official form or notice.
What is the Colorado Department of Revenue phone number for tax help?
The Colorado taxpayer helpline is 303-238-7378.
What are Colorado DOR taxpayer helpline hours?
Taxpayer Service Representatives are generally available Monday through Friday, 8:00 a.m. to 4:30 p.m. Mountain Time, except state holidays.
What is the Colorado Department of Revenue Collections phone number?
Colorado DOR Collections lists 303-205-8291.
What is the Colorado Department of Revenue Collections mailing address?
The Collections page lists Colorado Department of Revenue, Attn: Collections, P.O. Box 17087, Denver, CO 80217-0087.
What is the Colorado Springs Colorado DOR taxpayer service center address?
The official taxpayer service center page lists 2447 North Union Blvd., Colorado Springs, CO 80909.
Is the old Lakewood DOR office still open?
Colorado DOR pages note that the Lakewood office at 1881 Pierce St. is permanently closed and direct users to the new Denver location.
What is Revenue Online for Colorado?
Revenue Online is Colorado’s online service for filing state taxes and managing a state tax account.
What is SUTS in Colorado?
SUTS is the Sales & Use Tax System for state-administered and home-rule sales and use tax filing.
How do I find Colorado sales tax rates by address?
Use Colorado’s official Geographic Information System or sales tax lookup tools. Exact address and jurisdiction matter.
Does Colorado DOR handle DMV?
Colorado DMV is part of the Colorado Department of Revenue, but driver license, title and registration services use DMV-specific pages or county offices.
Where do I go for Colorado vehicle registration?
Use Colorado DMV online services or your county motor vehicle office, not the regular tax service center address.
Can I send express mail to Colorado DOR?
Some Colorado DOR units list 2829 W. Howard Pl., Denver, CO 80204 for express delivery. Use that only when the official unit page or notice gives it.
What should I include when mailing Colorado DOR a response?
Include your name, contact information, tax year, tax type, account number or letter ID, copies of supporting documents and the signed form or protest if required.
Can I visit Colorado DOR without checking online first?
You should check the official service center page first because appointment rules, hours, closures and available services can change.
Is this website the official Colorado DOR website?
No. This is an independent informational guide. Use official Colorado DOR, Taxation Division, DMV and Revenue Online pages for final filing, payment, mailing and legal decisions.
Final Recommendation: Use the Right Colorado DOR Address Before You Mail or Visit
For in-person tax help, start with the official taxpayer service center page and the Denver Metro address: 1351 5th St., Suite 100, Denver, CO 80204. For mail, use the exact address on the form or notice because Colorado DOR routes returns, payments, protests, sales tax, withholding and business taxes differently. For tax help, call 303-238-7378; for DMV matters, use Colorado DMV or your county motor vehicle office.
Last editorial update: June 7, 2026. Verify final office, mailing, payment, appointment, DMV and legal tax details on official Colorado Department of Revenue pages.