Where can I give away a hospital bed? It's an older model.

We gave one away on Craigslist.

Put the mattress if there is one at the curb with your garbage.
the metal bed frame a scrapper will take to the recycling station and get cash for it. (You could take it to the recycling station and get the cash yourself if you want but that’s work!)

Yes, try Nextdoor.com first

Try putting it on your local nextdoor or craigslist to see if anyone takes.