Riverbanks Zoo in South Carolina just added a new exhibit (Otter Run) and Cincinnati Zoo now has meerkats. A fresh look at the statistics of America's top 60 zoos (according to the Nyhuis/Wassner book America's Best Zoos):
Otters: There are 53 out of the top 60 zoos with at least one otter species, and the 7 zoos that lack otters are: Binder Park, Gladys Porter, Honolulu, Louisville, Nashville, Rio Grande and San Diego Zoo Safari Park.
Meerkats: There are 49 out of the top 60 zoos with meerkats, and the 11 zoos that lack the species are: Arizona-Sonora Desert Museum, Audubon, Binder Park, Bronx, Fort Wayne, Jacksonville, Maryland, Montgomery, North Carolina, Roger Williams Park and San Antonio.
Overall, there are some big-name zoos that surprisingly lack meerkats, but only a single zoo (Binder Park) without either meerkats or otters.