Islesboro is a town in Waldo County, Maine, United States. The population was 566 at the 2010 census. It has a summer colony accessible by ferry from Lincolnville Beach three miles to the west, by private boat, or by air taxi service. Home to Warren Island State Park, Islesboro includes the village of Dark Harbor.
According to the United States Census Bureau, the town has a total area of 68.88 square miles (178.40 km), of which 14.29 square miles (37.01 km) is land and 54.59 square miles (141.39 km) is water.
There is one large pond, called Meadow Pond, in the Northern portion of the Island, the work of beavers that have dammed a narrow place. Ice was once harvested from this pond for export to places as far away as India. Hewes Point was named for Paola Hewes, an early pioneer settler.
As of the census of 2010, there were 566 people, 270 households, and 161 families residing in the town. The population density was 39.6 inhabitants per square mile (15.3/km). There were 850 housing units at an average density of 59.5 per square mile (23.0/km). The racial makeup of the town was 97.9% White, 0.7% African American, 0.2% Native American, 0.2% Asian, 0.5% from other races, and 0.5% from two or more races. Hispanic or Latino of any race were 0.9% of the population.
There were 270 households of which 20.7% had children under the age of 18 living with them, 46.7% were married couples living together, 7.0% had a female householder with no husband present, 5.9% had a male householder with no wife present, and 40.4% were non-families. Of all households 34.4% were made up of individuals and 15.2% had someone living alone who was 65 years of age or older. The average household size was 2.07 and the average family size was 2.57.
The median age in the town was 52.1 years. 17.3% of residents were under the age of 18; 3.4% were between the ages of 18 and 24; 17.4% were from 25 to 44; 37.5% were from 45 to 64; and 24.4% were 65 years of age or older. The gender makeup of the town was 48.2% male and 51.8% female.
As of the census of 2000, there were 603 people, 280 households, and 176 families residing in the town. The population density was 42.3 people per square mile (16.3/km²). There were 741 housing units at an average density of 52.0 per square mile (20.1/km²). The racial makeup of the town was 98.18% White, 0.17% African American, 0.17% Native American, 0.17% Asian, 0.50% from other races, and 0.83% from two or more races. Hispanic or Latino of any race were 1.33% of the population.
There were 280 households out of which 25.0% had children under the age of 18 living with them, 53.2% were married couples living together, 5.7% had a female householder with no husband present, and 36.8% were non-families. Of all households 30.7% were made up of individuals and 13.6% had someone living alone who was 65 years of age or older. The average household size was 2.15 and the average family size was 2.69.
In the town, the population was spread out with 20.2% under the age of 18, 3.3% from 18 to 24, 25.4% from 25 to 44, 31.2% from 45 to 64, and 19.9% who were 65 years of age or older. The median age was 46 years. For every 100 females, there were 97.1 males. For every 100 females age 18 and over, there were 97.1 males.
The median income for a household in the town was $39,643, and the median income for a family was $48,750. Males had a median income of $35,000 versus $24,750 for females. The per capita income for the town was $25,653. About 5.5% of families and 7.2% of the population were below the poverty line, including 8.3% of those under age 18 and 9.7% of those age 65 or over.