From a total population of 339, Nisland has a median age of 42. The average age of males, in Nisland, is 46.3 while the average age of females is 41.4. When you compare this to median age of South Dakota, Nisland is 5.2 years older.
The median income of individuals, in Nisland, is $14,691 while the average household income is $36,750. When comparing the median income of people living in Nisland to the rest of South Dakota, the average income in Nisland is $11,620 less.