File:Diamondcity.jpg
Diamond City, as seen in the WarioWare series.
Diamond City is a city, in the WarioWare Inc. series. Here Wario and his friends do parties, and some live here.
It is unknown where Diamond City is located. It might be in The Mushroom Kingdom or even Kitchen Land.
Diamond City also appears in Mario Kart GP as a course. E. Gadd's logo can strangely be seen in the background of the course.