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As of the 2010 United States Census, Marion, located in the Mount Rushmore State, had a total population of 730 people.
From a total population of 730, Marion has a median age of 53.9. The average age of males, in Marion, is 52.9 while the average age of females is 54.9. When you compare this to median age of South Dakota, Marion is 17.1 years older.
The median income of individuals, in Marion, is $23,187 while the average household income is $38,977. When comparing the median income of people living in Marion to the rest of South Dakota, the average income in Marion is $3,124 less.