Cloudsdale

Cloudsdale is the cloud city located above the skies of Ponyville. It is the hometown of Rainbow Dash. She visits it in the episode Sonic Rainboom, where she meets old acquaintences of hers from flight school. Unlike Ponyville, Cloudsdale is only home to pegasus ponies, as the whole city is made of clouds, which normally only pegasus ponies can walk on. Twilight uses her magic to allow her friends and herself to walk on the clouds in order to cheer for Rainbow Dash as she enters the Best Young Flyer competition. The city also holds a weather-making factory, where rainbows, snowflakes, and clouds are made for the needs of Equestria.

Trivia

"Dale," when associated with places, particularly as a suffix, is an old word for a valley, but the name is more likely a pun on the Clydesdale breed of horses.