Mount Desert is a town on Mount Desert Island in Hancock County, Maine, United States. The population was 2,053 at the 2010 census. Incorporated in 1789, the town currently encompasses the villages of Otter Creek, Seal Harbor, Northeast Harbor, Somesville, Hall Quarry, and Pretty Marsh.

According to the United States Census Bureau, the town has a total area of 54.88 square miles (142.14 km²), of which 36.88 square miles (95.52 km²) is land and 18.00 square miles (46.62 km²) is water.

As of the census of 2010, there were 2,053 people, 984 households, and 586 families residing in the town. The population density was 55.7 inhabitants per square mile (21.5/km²). There were 2,287 housing units at an average density of 62.0 per square mile (23.9/km²). The racial makeup of the town was 98.1% White, 0.3% African American, 0.1% Native American, 0.7% Asian, 0.1% from other races, and 0.7% from two or more races. Hispanic or Latino of any race were 0.9% of the population.

There were 984 households of which 20.9% had children under the age of 18 living with them, 51.0% were married couples living together, 5.7% had a female householder with no husband present, 2.8% had a male householder with no wife present, and 40.4% were non-families. 32.7% of all households were made up of individuals and 11.8% had someone living alone who was 65 years of age or older. The average household size was 2.09 and the average family size was 2.64.

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