Nielsville (/ˈniːlzvɪl/ NEELZ-vil)[6] is a city in Polk County, Minnesota, United States.

It is part of the Grand Forks, ND-MN Metropolitan Statistical Area.

[8] According to the United States Census Bureau, the city has a total area of 0.289 square miles (0.75 km2), all land.

There were 56 housing units at an average density of 155.6 per square mile (60.1/km2).

52.4% of all households were made up of individuals, and 19.1% had someone living alone who was 65 years of age or older.

40.0% of all households were made up of individuals, and 20.0% had someone living alone who was 65 years of age or older.