I live in Troy MI, I am ready to file my 2019 tax, which IRS office i should send, I did file my 2020 return.

[xmasbaby0]

https://www.irs.gov/filing/where-to-file-paper-tax-returns-with-or-without-a-payment

Federal and state returns must be mailed separately to different addresses

https://ttlc.intuit.com/community/state-taxes/help/how-do-i-contact-my-state-department-of-revenue/0...

[DoninGA]

If you are not enclosing a payment with the tax return -

Department of the Treasury
Internal Revenue Service
Ogden, UT 84201-0002

If you are enclosing a payment with the tax return -

Internal Revenue Service
P.O. Box 802501
Cincinnati, OH 45280-2501

https://www.irs.gov/filing/michigan-where-to-file-addresses-for-taxpayers-and-tax-professionals