This is a list of the most common U.S. place names (cities, towns, villages, boroughs and census-designated places [CDP]), with the number of times that name occurs (in parentheses). Some states have more than one occurrence of the same name. Cities with populations over 100,000 are in bold.
Postal Service data
The United States Postal Service has published a list of the most common city and post office names within the United States, as of 2020:
All place names
Washington (91)
The State of Washington
31 of the 50 United States are home to a Washington County.
There are 5 Washington Townships (and one Washington Borough) in the State of New Jersey.
There are 7 Towns of Washington (and one Town of Port Washington) in the State of Wisconsin which correspond to townships rather than municipalities.
Louisiana is home to both a village/town of Washington, and a Washington Parish (equivalent to a county in most other states)