Old mattresses can be disposed of through a donation to a local homeless shelter, donation to a local church, donation to friends or family, donation to Goodwill or the Salvation Army or through recycling. It is also possible to throw the mattress away as long as a trash site can be located.
It is also a good idea to post a message to social media so that friends of friends can chime in if they are interested in taking the mattress. It is always better to give a mattress away to an individual or organization as they will often pick up the mattress for free. To throw away the mattress, the mattress owner will need to coordinate drop-off.