Hackensack is a city in Cass County, Minnesota, United States. The population was 313 at the 2010 census. It is part of the Brainerd Micropolitan Statistical Area.
According to the United States Census Bureau, the city has a total area of 0.7 square miles (1.9 km²), of which, 0.7 square miles (1.8 km²) of it is land and 1.39% is water.
Minnesota State Highway 371 serves as a main route in the community.