Christmas trees should be composted or mulched like yard waste rather than sent to landfills or incinerators. Many municipalities provide curbside Christmas tree collections as part of their yard waste collection program. Check with your municipality or hauler for details and remember to remove all inorganic materials such as lights, decorations, and stands from the tree.
Souderton student group SAVE holds an annual Christmas tree recycling collection at Franconia Park, see https://sites.google.com/view/savesahs/home for details.