The mailing address to file your federal income tax return will depend on which state you live in (or if you live outside of the U.S.),
and on whether you enclosing a payment or not. Please see the following
IRS guide, "Where to File Addresses for Taxpayers and Tax Professionals
Filing Form 1040":
https://www.irs.gov/uac/where-to-file-addresses-for-taxpayers-and-tax-professionals-filing-form-1040
