Getty Images Getty ImagesI decided to chart the 10 oldest municipalities in Maine that are considered cities. Where Can Maine's Oldest Cities be Found? And some of these cities are quite small, especially considering they are, well, cities. The oldest dates back to about 20 years after the state was founded, which means Maine technically had no cities for the first few decades of its existence. Maine's 10 Oldest Cities by Incorporation Date Here is a list of Maine's 10 oldest cities ranked by the age of the municipality.