Used furniture can be donated to charities such as church groups, Goodwill Stores, The Salvation Army, homeless shelters, or just to someone in the community that is in need. Any nonprofit agency might accept a donation of good used furniture.
To find more groups that accept used furniture donations, do a search for charitable groups near the local ZIP code. Furniture that is to be donated needs to be in good enough condition that it can be used without needing repairs. Some charities such as Goodwill or The Salvation Army pick up donated furniture if arrangements are made in advance.