Bloons

Normal Bloons

 * Red Bloon = 1 layer
 * Blue Bloon = 2 layer
 * Green Bloon = 3 layers
 * Yellow Bloon = 4 layers
 * Pink Bloon = 5 layers
 * Black Bloon = 11 layers total ; Explosions do not effect it (ex. Bomb Tower)
 * White Bloons = 11 layers total ; Freeze Tower does not effect it

Strong Bloons

 * Lead Bloon = 23 layers total ; Nothing Sharp can pop them
 * Zebra Bloon = 23 layer total ; Explosions and Freeze Towers do not effect it
 * Rainbow Bloon = 47 layers total
 * Ceramic Bloon = 95 layers total ; Takes 10 hits to destroy it's layer

MOAB Class Bloons
All bloons listed here are from BTD 5.
 * MOAB = 381 layers ; Contains 4 Ceramic Bloons
 * BFB = 1 525 layers ; Contains 4 MOABs
 * ZOMG = 6 101 layers ; Contains 4 BFBs

More Types
In Bloons Tower Defense 5, there can also be camo bloons and regenerative bloons.

In BTD 4, there would also be a camo bloon.