I've been on 59:
Carowinds: 13
Busch Gardens Williamsburg: 7
King's Dominion: 10
Six Flags Over Georgia: 10
Busch Gardens Tampa: 8
Sea World Orlando: 4
Universal's Islands Of Adventure: 5
Universal Studios Florida: 1
Disney's Animal Kingdom: 1
This list incluced all double/dueling/racing, defunct, kiddie, watercoasters and anything according to the coasterfanatics count that count as a coaster.
Carowinds: 13
Busch Gardens Williamsburg: 7
King's Dominion: 10
Six Flags Over Georgia: 10
Busch Gardens Tampa: 8
Sea World Orlando: 4
Universal's Islands Of Adventure: 5
Universal Studios Florida: 1
Disney's Animal Kingdom: 1
This list incluced all double/dueling/racing, defunct, kiddie, watercoasters and anything according to the coasterfanatics count that count as a coaster.