This article represents the range of height taken from the vital statistics for various races given in the RPG. These more or less represent the most healthy members of the race, the ones that may become heroes. The base height represents the lowest possible height for a healthy adult individual in the race.
Since the RPG is not necessarily canon, this info is advisory.
i List of playable races' heights in order. (Going from tallest to smallest, 12 being the tallest, based on male height):
12. Tauren, 11. Night Elf, 10. Troll, 9. Draenei, 8. Worgen (Draenai and Worgen are very similar in height), 7. Orc, 6. Blood Elf, 5. Human (Orcs, Blood elves, humans, and Forsaken are also similar in height), 4. Forsaken, 3. Dwarf, 2. Goblin, and 1. Gnome (Gnomes and Goblins are basically the same height).
r At adulthood, but continue to grow. A fully grown ogre would be between 8 feet and 25 feet, the average for the larger ogres is 15 feet. Though some ogres are small barely larger than 6 or 7 feet.