I recently found out about a website: catalogchoice.org. It is free although they do ask for donations. Once you set it up it is very easy to enter a catalog. Catalog choice notifies them to stop mailing. I started in mid-September and have been adding catalogs steadily. I think I'm aware of a couple that have stopped but not really sure. With the holidays approaching I'm getting more catalogs than ever it seems.
The website has a place where you can indicate if the mailing has stopped but don't know if they take action if you say no. They ask that you wait 6-8 weeks for mail to stop.
So at this point, I'm waiting to see if I notice a big drop after the holidays. In recent months I've picked up my mail and had a good 3-6 inches of nothing but catalogs which I have to turn around and carry to our dump. I would rather shop online but also wonder if the mailings stop and I then order will I go back to getting catalogs? Very frustrating.