Second Chance Wildlife Center
Second Chance takes in orphaned, injured, and sick Maryland native wild animals. They do not deal with domestic and non-native species. They also do not adopt out any of their charges to the general public. If you find a wild animal in need of assistance contact them.
Phoenix Wildlife Center
Founded in 1992, the Phoenix Wildlife Center is a 501(c)3 tax exempt, non-profit organization dedicated to the rehabilitation and return to the wild of native birds, mammals, and reptiles and to the education of the public on wildlife issues.
Mid-Atlantic Turtle & Tortoise Society
If you are looking for a companion who is hard on the outside but lovable on the inside why not consider a turtle or tortoises? There are always animals up for adoption at MATTS. They also take in a limited number of animals. Check out these armored survivors.
Rude Ranch Animal Rescue
If you are interested in a cat, there are many feline shelters out there. One of which is Rude Ranch, a non-profit no kill shelter dedicated to saving abandoned, neglected, and abused animals.
Petfinder
Of course there is also Petfinder.com for a more complete list of shelters from across the nation. They provide a list of available animals cataloged by type.