Passadumkeag is a town on the east bank of the Penobscot River at the confluence with the Passadumkeag River in Penobscot County, Maine, United States. The population was 374 at the 2010 census. Passadumkeag is a word of the Penobscot people meaning “quick water”.
According to the United States Census Bureau, the town has a total area of 23.07 square miles (59.75 km2), of which, 22.92 square miles (59.36 km2) of it is land and 0.15 square miles (0.39 km2) is water.
As of the census of 2010, there were 374 people, 159 households, and 103 families residing in the town. The population density was 16.3 inhabitants per square mile (6.3 /km2). There were 197 housing units at an average density of 8.6 per square mile (3.3 /km2). The racial makeup of the town was 95.5% White, 0.8% Native American, 0.5% Asian, and 3.2% from two or more races. Hispanic or Latino of any race were 0.8% of the population.
There were 159 households out of which 27.0% had children under the age of 18 living with them, 51.6% were married couples living together, 8.2% had a female householder with no husband present, 5.0% had a male householder with no wife present, and 35.2% were non-families. 27.0% of all households were made up of individuals and 11.3% had someone living alone who was 65 years of age or older. The average household size was 2.35 and the average family size was 2.81.
The median age in the town was 45.1 years. 20.3% of residents were under the age of 18; 7.2% were between the ages of 18 and 24; 22.2% were from 25 to 44; 31.5% were from 45 to 64; and 18.7% were 65 years of age or older. The gender makeup of the town was 48.9% male and 51.1% female.