Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Poplar Grove Township is a township in Roseau County, Minnesota, United States. The population was 80 at the 2000 census.According to the United States Census Bureau, the township has a total area of 36.0 square miles (93.2 km²), of which, 36.0 square miles (93.1 km²) of it is land and 0.04 square miles (0.1 km²) of it (0.06%) is water.As of the census of 2000, there were 80 people, 31 households, and 22 families residing in the township. The population density was 2.2 people per square mile (0.9/km²). There were 41 housing units at an average density of 1.1/sq mi (0.4/km²). The racial makeup of the township was 98.75% White and 1.25% Asian.