The mailing address to file your federal income tax return to the IRS from Washington State will depend on whether you enclosing a payment or not:

Use this address if you are enclosing a payment:

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

Use this address if you are not enclosing a payment:

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

What the address I mail my tax return!

Where are you mail tax return 

The mailing address for your tax return(s) is normally printed on your filing paperwork. If you don't see that address, then you can find it below:

The mailing addresses for your federal return are as follows:

If you are claiming a refund then mail your return to:

Department of Treasury

Internal Revenue Service

Fresno, CA 93888-0002

If you are mailing a payment then mail your return to:

Internal Revenue Service

P.O.Box 7704

San Francisco, CA 94120-7704