North Washington is an unorganized territory in Washington County, Maine, United States. The population was 499 at the 2010 census.
According to the United States Census Bureau, the unorganized territory has a total area of 979.6 square miles (2,537.2 km²), of which 886.1 square miles (2,295.0 km²) is land and 93.5 square miles (242.2 km²), or 9.55%, is water.
The territory consists of 28 townships plus the former town of Centerville.
As of the census of 2000, there were 547 people, 232 households, and 157 families residing in the unorganized territory. The population density was 0.6 people per square mile (0.2/km²). There were 1,044 housing units at an average density of 1.2/sq mi (0.5/km²). The racial makeup of the unorganized territory was 95.25% White, 0.18% Black or African American, 3.47% Native American, 0.55% from other races, and 0.55% from two or more races. Hispanic or Latino of any race were 0.73% of the population.
There were 232 households out of which 26.7% had children under the age of 18 living with them, 56.0% were married couples living together, 5.6% had a female householder with no husband present, and 32.3% were non-families. 28.0% of all households were made up of individuals and 10.3% had someone living alone who was 65 years of age or older. The average household size was 2.36 and the average family size was 2.85.