Does every state have a zoo?

The state that don't have Zoo's are Iowa, New Hampshire, Vermont and Wyoming.

FYI --- Iowa does have a zoo which started in 1966. It is located in Des Moines and is call The Blank Park Zoo.

From Wikipedia

In 1963, Mr. A.H. Blank donated $150,000 ($916,000 in 2005 dollars) for the construction of a children's zoo on decommissioned Fort Des Moines property. The Des Moines Children's Zoo was officially opened on May 8, 1966,

I so happen to work very close to this zoo.