Just wondered the same and found this: https://www.consumer.ftc.gov/articles/0262-stopping-unsolici...
And I found about this http://www.dmaconsumers.org/offmailinglist.html
Re:One person's war on junk mail (1996)
by annoyingnoob on Wednesday May 12, 2021 @11:50PM
(#27138180)
This took care of a lot of it: https://www.dmachoice.org
I think this one is for the grocery coupons: https://www.valassis.com/opt-out/
I had to make a lot of phone calls and ask to be taken off the list.
Mails addressed at "resident at ..." drive me crazy.