High Quality Content by WIKIPEDIA articles! Ellsworth is a city in and the county seat of Hancock County, Maine, United States. The 2010 Census determined it had a population of 7,741. Ellsworth was Maine`s fastest growing city from 2000-2010 with a growth rate of nearly 20 percent. With many historic buildings and points of interest, Ellsworth is busy from May until September with visitors from all over the United States and Canada. In addition, the city is the gateway for tourists visiting nearby Acadia National Park, Mount Desert Island and the Bar Harbor region.