In Doubutsu no Mori
A total of 64 wallpapers appear in Doubutsu no Mori.
In Animal Crossing
The international version of Animal Crossing introduces another three wallpapers—the mushroom mural, ringside seating, and harvest wall—making for a total of 67. The bathhouse wall and worn-out dirt wall from Doubutsu no Mori and Doubutsu no Mori+ are also replaced by the western vista and backyard fence, respectively, in the international version.
In Doubutsu no Mori e+
Doubutsu no Mori e+ features all wallpapers from Animal Crossing as well as the two wallpapers removed from the international version of Animal Crossing.
In Wild World
In City Folk
In New Leaf
In New Horizons
A total of 262 wallpapers appear in Animal Crossing: New Horizons as of version 1.9.0, with 20 being added in updates. Most wallpapers can be purchased from Nook's Cranny or Saharah, or obtained via crafting.
Wallpapers can now have animations, and each wallpaper has a different window style.