This list was issued by In Defense of Animals last month.
Here they are...
San Antonio Zoo (Texas)
Edmonton Valley Zoo (Canada),
Buttonwood Park Zoo (Mass.),
Central Florida Zoo (Fla.),
Niabi Zoo (Ill.), Topeka Zoo (Kan.),
Honolulu Zoo (Hawaii),
Wildlife Safari (Ore.),
York's Wild Kingdom Zoo (Maine) tied with Southwick's Zoo (Mass.),
Pittsburgh Zoo's ICC (Penn.).
San Diego Zoo Safari Park (Calif.) earned a dishonorable mention.
I'm surprised that Woodland Park Zoo in Seattle didn't make it.