Grad is a Slavic term meaning town. Upon my research, I haven't found any US cities ending in -grad. This may be because the US does not have a significant Slavic culture.
There are several US cities named 'Bagdad.'
Nope.
There are so many, Georgia has 21 that i know of.
No there arent
PhoeniX, Arizona
There is a Springfield in every state.
Frandenstein, Missouri
lydia
There is a huge list of such cities, any city that was and is in another country
There are no cities, but there is an unincorporated community named Zoe, in Lee County, Kentucky.
Upland, CA
Yes, Justice, IL.