Two local "ReStore" places, which are sales outlets somehow related to Habitat For Humanity:
http://www.chesapeakerestore.org/index.php
http://habitat.montgomery.md.us/restore/index.html
The list of what the the chesapeake one takes is pretty liberal:
http://www.chesapeakerestore.org/donate/guidelines.php
http://habitat.montgomery.md.us/restore/donate.html?gclid=CNmUlcOu6qoCFcmG5godR0InNg#whatweaccept
The Chesapeake one has a list to other Habitat For Humanity locations, which shows a Hyattsville (Brentwood) location.
http://www.habitat.org/cd/env/restore.aspx
http://www.habitat.org/cd/env/restore_detail.aspx?place=45
I wonder if it's this "Community Forklift" location, which has a surprizing number of restrictions on what it will take:
http://search.earth911.com/location/0NmZ0VmZ/?what=Reusable+Appliance+Donation&where=20785&max_distance=25&country=US&province=MD&city=Hyattsville®ion=Prince+Georges&postal_code=20785&latitude=38.9186166005&longitude=-76.8823417396&family_id=98&list_filter=all
http://communityforklift.com/Donation.cfm
http://communityforklift.com/departments/appliances.cfm