Catalogs: Call the company. Have the label on the back of the catalog handy. Ask to be removed from the mailing list.
Credit card offers: 888-5OPTOUT (888) 567-8688.
General Junk Mail:
Direct Marketing Association
DMA Mail Preference Service
P.O. Box 9008
Farmingdale, NY 11735-9008
ask to removed from junk mail lists.