Six.
Level 80 tauren paladin
Level 70 tauren warrior
Level 70 tauren rogue
Level 70 tauren priest
Level 70 Highmountain warlock
Level 55 Highmountain druid
This ties them for my second most-rolled race alongside dwarves and draenei, behind the first place tie of gnomes and trolls at 7 each.
Although dwarves are kinda sketchy, since they’re counting a fresh level 10 Earthen I’ve done nothing with but complete the intro stuff to unlock their starter gear mogs for my other dwarves. Without her, dwarves drop back to a third place tie with humans and orcs at 5 apiece, coming in ahead of night elves, worgen, and goblins at 4. Pandaren, blood elves, and undead bring up the rear at 3 each, with dracthyr forming the 1-woman caboose.