Amsterdam tops the list, and the Plan of Philadelphia is #20. In between, there are a number of Garden City-influenced suburbs and the inevitable High Line. Marimont, Ohio is #12:
"When Thomas J. Emery died in 1906, his widow, Mary Emery, undertook to erect a new town intended to serve as a national exemplar for suburban American and a permanent monument to her husband's memory. Thus, as one of the first planned communities in the United States, Mariemont is well-known for its charming historic architecture, lush foliage, award-winning schools and friendly, community-minded residents."