The Maryland Zoo in Baltimore - 2000 animals including a children's zoo. General information, special events, exhibit overview, zoo map, education program summary, conservation information and online quizzes. - http://www.marylandzoo.org/
Plumpton Park Zoo - Rising Sun in Cecil County. Includes visitor information, zoo map, and list of animals with photos. - http://www.plumptonparkzoo.org/
Catoctin Wildlife Preserve and Zoo - Thurmont. Over 350 exotic animals on 26 beautiful acres. Membership, party, group visit, adopt-an-animal, volunteering and event information. - http://www.cwpzoo.com/
National Aquarium in Baltimore - Visitor information, aquarium map, exhibit descriptions, education program summary, animal photos and descriptions, research and conservation project information, and online interactive aquagames. - http://www.aqua.org/
Salisbury Zoo - Admission, hours of operation, directions, zoo map and animal photos. - http://www.salisburyzoo.org/