For geographic and demographic information on specific parts of the town of Bourne, please see the articles on Bourne (CDP), Buzzards Bay, Monument Beach, and Sagamore.
Geography
According to the United States Census Bureau, the town has a total area of 136.8 km² (52.8 mi²). 106.0 km² (40.9 mi²) of it is land and 30.8 km² (11.9 mi²) of it is water. The total area is 22.53% water.
Demographics
As of the census of 2000, there are 18,721 people, 7,439 households, and 5,013 families residing in the town. The population density is 176.7/km² (457.6/mi²). There are 9,648 housing units at an average density of 91.1 persons/km² (235.8 persons/mi²). The racial makeup of the town is 94.72% White, 1.39% African American, 0.53% Native American, 0.71% Asian, 0.01% Pacific Islander, 0.99% from other races, and 1.65% from two or more races. 1.46% of the population are Hispanic or Latino of any race.
There are 7,439 households out of which 28.2% have children under the age of 18 living with them, 54.6% are married couples living together, 9.4% have a woman whose husband does not live with her, and 32.6% are non-families. 26.8% of all households are made up of individuals and 11.8% have someone living alone who is 65 years of age or older. The average household size is 2.39 and the average family size is 2.90.
In the town the population is spread out with 21.9% under the age of 18, 9.4% from 18 to 24, 27.3% from 25 to 44, 23.8% from 45 to 64, and 17.6% who are 65 years of age or older. The median age is 39 years. For every 100 females there are 97.1 males. For every 100 females age 18 and over, there are 95.9 males.
The median income for a household in the town is $45,113, and the median income for a family is $51,603. Males have a median income of $40,217 versus $28,163 for females. The per capita income for the town is $22,092. 7.1% of the population and 5.8% of families are below the poverty line. Out of the total people living in poverty, 10.4% are under the age of 18 and 4.7% are 65 or older.