2010 census

As of the census^[4] of 2010, there were 141 people, 70 households, and 33 families residing in the town. The population density was 44.5 inhabitants per square mile (17.2/km²). There were 375 housing units at an average density of 118.3 per square mile (45.7/km²). The racial makeup of the town was 97.9% White, 0.7% African American, and 1.4% from two or more races. Hispanic or Latino of any race were 2.1% of the population.

There were 70 households, of which 20.0% had children under the age of 18 living with them, 37.1% were married couples living together, 5.7% had a female householder with no husband present, 4.3% had a male householder with no wife present, and 52.9% were non-families. 42.9% of all households were made up of individuals, and 20% had someone living alone who was 65 years of age or older. The average household size was 2.01 and the average family size was 2.70.

The median age in the town was 47.7 years. 17.7% of residents were under the age of 18; 4.3% were between the ages of 18 and 24; 23.3% were from 25 to 44; 34% were from 45 to 64; and 20.6% were 65 years of age or older. The gender makeup of the town was 54.6% male and 45.4% female.

2000 census

As of the census^[5] of 2000, there were 128 people living year round in the Cranberry Isles. The population density of Great Cranberry Island was 40.3 people per square mile (15.6/km²). There were 344 housing units at an average density of 108.4 per square mile (41.9/km²). The racial makeup of the town was 98.44% White, and 1.56% from two or more races.