When you print the return to mail there is a cover page that tells you what documents to include with the return and the address to mail it to.
Federal and state returns must be mailed in separate envelopes to the correct addresses. You must sign the forms in all places indicated before mailing.
If you are in Washington state here are the addresses to use for federal
If you are not enclosing a payment:
Department of Treasury Internal Revenue Service Ogden, UT 84201-0002
If you are enclosing a payment mail the 1040 to:
Internal Revenue Service
P O Box 802501
Cincinnati, OH 45280-2501
