In 1990, the U.S. zoos with highest attendance were:
1. Lincoln Park Zoo, Chicago, Illinois
2. San Diego Zoo, California
3. National Zoo, Washington, D.C.
4. Busch Gardens, Tampa, Florida
5. St. Louis Zoo, Missouri
In 1990, the U.S. zoos with highest attendance were:
1. Lincoln Park Zoo, Chicago, Illinois
2. San Diego Zoo, California
3. National Zoo, Washington, D.C.
4. Busch Gardens, Tampa, Florida
5. St. Louis Zoo, Missouri