Nobody has proven that dragons exist. Is it possible that dragons could have once walked on this planet? Yes. The last census put the total world population of dragons at 3267, but you known how 'everybody' lies on those things.
As of 4th edition, there are five main types of chromatic dragons- red, green, blue, white, and black. There are also about a dozen various types of metallic dragons, like gold dragons and mithril dragons.
If you want to know the number of individual dragons, I'd put that number in the thousands.
This isn't a answer but you put this in the wrong category but if your asking how many dragon type Pokemon there are there are 19.
As much as you want as long you have dragons
There is a total of nine dragons in the Dragon City.
coolfire dragon
To know the secret dragons if the Dragon City you need to know the cheats and guides of this game.
gummy dragon and coolfire dragon
legendary dragon
Legendary dragon weakness is legend dragons
DragonCityGuide.net is the best place to find out which dragons to breed together to get a Paladin dragon in Dragon City!
electric dragon and earth dragon
cool fire dragon + armadillo dragon
water dragon+ice dragon
The 2 dragons to get the cactus is EARTH+PLANT.
earth and metal