One of the most common errors when editing the maps is when an editor creates a road and does not confirm the road by setting the city and road name (or stating it has none).
Duplicate cities can be caused by incorrectly named segments and should be corrected following the guidelines in the duplicate cities article.
Due to the different municipal structures making up each state, the handling of cities and towns are particular to each state. Please see the respective state guidance for additional details:
Connecticut Cities and Towns
Maine Cities and Towns
Massachusetts Cities and Towns
New Hampshire Cities and Towns
Rhode Island Cities and Towns
Vermont Cities and Towns