https://www.irs.gov/filing/where-to-file-paper-tax-returns-with-or-without-a-payment
You will have to mail your MD return in a separate envelope:
Here is a link to the MD site where you can look up the address
https://taxes.marylandtaxes.gov/Individual_Taxes/Taxpayer_Assistance/Contact_Information/
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
