Here they come, the seasonal wave of fat catalogs overflowing your mailbox!
You will almost certainly get some from companies you've never done business with and have no interest in doing business with. Don't just toss these.
Put them by the phone and then when you're doing some task that allows for having a phone by your ear (I do this in the kitchen usually), call them up and ask to be removed from their mailing list.
Yes, it's kind of a pain to make the call, but it really does help reduce the flow of junk mail once you've been doing this for a while. I get far less than I used to.
Discardia 
If they do not have a toll free number or if there is an envelope/order form in the catalog-send the order form with a big remove from mailing list note in the envelope. Better yet, buy locally so your name doesn’t get on lots of mailing lists.
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I print up generic “Please take me off your list” notes and slip them into envelopes when I get junk mail I don’t want. I also try to remember when I do give people my address to also tell them that I don’t want any mailings.
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http://www.catalogchoice.org/dashboard
easy way to stop most catalogs
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