Edited: (even more details)
If your printed form has a 2D barcode on it......Page 2 of the MO instructions (bottom of left column) has several addresses ...based on whether you are getting a refund, or are having to pay a balance due
https://dor.mo.gov/forms/MO-1040%20Instructions_2019.pdf
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If your printed form does not have a 2D barcode on it......Page 4 of the MO instructions (left column) has several addresses ...based on whether you are getting a refund, or are having to pay a balance due
The Turbotax "file by mail instructions" that prints out with my return shows a different address (PO Box 3222) than the address within the actual tax form (PO Box 500).
I assume the Turbotax address is wrong?