High Quality Content by WIKIPEDIA articles! Wallagrass is a town in Aroostook County, Maine, United States. The population was 561 at the 2000 census.According to the United States Census Bureau, the town has a total area of 40.5 square miles (104.8 km²), of which, 39.8 square miles (103.0 km²) of it is land and 0.7 square miles (1.8 km²) of it (1.68%) is water.As of the census of 2000, there were 561 people, 217 households, and 159 families residing in the town. The population density was 14.1 people per square mile (5.4/km²). There were 308 housing units at an average density of 7.7/sq mi (3.0/km²). The racial makeup of the town was 99.29% White, 0.53% from other races, and 0.18% from two or more races. Hispanic or Latino of any race were 0.53% of the population.