What is the IRS mailing address to mail a tax return in CO

[ddaven12 · Accepted solution]

If you are not mailing a payment, please mail to:

Department of the Treasury
Internal Revenue Service
Fresno, CA 93888-0002 

If you are enclosing a payment, please mail to:

Internal Revenue Service
P.O. Box 7704
San Francisco, CA
94120-7704 

For more information:  IRS.gov