There are a few ways to dispose of a mattress. One is to recycle it through a local recycling program, in which you may have to pay a fee. If it's in really good condition, you might be able to donate it, though Goodwill, the Salvation Army, and other well-known donation centers can't accept used mattresses. Another option is to sell it or just post it for free on an online marketplace such as Craigslist or Facebook. And if your main concern is physically transporting it out of your home, you might consider using a mattress removal service.