Check with your local dry cleaning business for recycling hangers. Most dry cleaners will accept undamaged hangers for reuse.
Accepts wire hangers:
Recycling Services, Inc.
365 Elm Street
Pottstown, PA 19465
(P) 610-323-8545
Plastic hangers:
http://www.ehow.com/how_5836082_recycle-plastic-hangers.html