Brooklin was originally part of a larger town, then Sedgwick broke off and formed its own town. A few weeks later, the name was changed to Brooklin, after the brook line which separated it from Sedgwick. Using porgyoil as a fertilizer, the difficult soil was made productive, and hay became the principal crop. With excellent harbors, however, the main occupations were fishing and seafaring. By 1859, when the population was 1,002, it also had five boot and shoemaking factories, as well as two barrel manufacturers. By 1886, the town was noted for producing smoked herring in considerable quantities. Canning lobster had also become an important business.
As of the census of 2010, there were 824 people, 397 households, and 238 families living in the town. The population density was. There were 874 housing units at an average density of. The racial makeup of the town was 97.9% White, 1.0% Asian, 0.4% from other races, and 0.7% from two or more races. Hispanic or Latino of any race were 0.5% of the population. There were 397 households, of which 19.1% had children under the age of 18 living with them, 52.6% were married couplesliving together, 4.8% had a female householder with no husband present, 2.5% had a male householder with no wife present, and 40.1% were non-families. 33.8% of all households were made up of individuals, and 14.6% had someone living alone who was 65 years of age or older. The average household size was 2.08 and the average family size was 2.63. The median age in the town was 52.9 years. 17.2% of residents were under the age of 18; 4.8% were between the ages of 18 and 24; 16.4% were from 25 to 44; 35.4% were from 45 to 64; and 26.1% were 65 years of age or older. The gender makeup of the town was 48.3% male and 51.7% female.
2000 census
As of the census of 2000, there were 841 people, 371 households, and 244 families living in the town. The population density was 46.8 people per square mile. There were 697 housing units at an average density of 38.8 per square mile. The racial makeup of the town was 98.45% White, 0.12% African American, 0.12% Native American, 0.59% Asian, 0.36% from other races, and 0.36% from two or more races. Hispanic or Latino of any race were 0.95% of the population. There were 371 households, out of which 26.4% had children under the age of 18 living with them, 56.9% were married couples living together, 6.2% had a female householder with no husband present, and 34.2% were non-families. 29.1% of all households were made up of individuals, and 14.6% had someone living alone who was 65 years of age or older. The average household size was 2.27 and the average family size was 2.79. In the town, the population was spread out, with 21.5% under the age of 18, 4.2% from 18 to 24, 22.9% from 25 to 44, 33.1% from 45 to 64, and 18.3% who were 65 years of age or older. The median age was 46 years. For every 100 females, there were 94.7 males. For every 100 females age 18 and over, there were 90.2 males. The median income for a household in the town was $36,786, and the median income for a family was $46,591. Males had a median income of $30,250 versus $23,750 for females. The per capita income for the town was $21,704. About 6.9% of families and 12.7% of the population were below the poverty line, including 21.3% of those under age 18 and 9.3% of those age 65 or over.
Archaeology
An 11th-century Norse coin was found in Brooklin at the site of an excavation of a Native American trading center. If true this would be the only physical evidence of Nordic settlers having entered the area of what is now the United States. If not an outright hoax, it is also possible that the coin was brought to the site not directly by Vikings, but rather through trading.
