 nielsville is a city in polk county, minnesota, united states. it is part of the grand forks, nd-mn metropolitan statistical area. the population was 90 at the 2010 census. ==geography== according to the united states census bureau, the city has a total area of , all of it land.{{cite web|title=us gazetteer files 2010|url=http
Cities_in_Minnesota Cities_in_Polk_County,_Minnesota