Canterlot is extant.
Baltimare, Ponyville, Appleloosa, and Dodge City are extant but relocated.
Cities that are canonically Vanhoover, Tall Tale, Applewood, and Fillydelphia are AU renamed.
Los Pegasus, Manehattan, and Cloudsdale are not extant.
If it’s on there and it’s a settlement, it’s a horse pun. Most should be easily Wiki-able.