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As of the 2010 United States Census, Marshall County, located in the Hawkeye State, had a total population of 40,922 people.
From a total population of 40,922, Marshall County has a median age of 38.6. The average age of males, in Marshall County, is 37.5 while the average age of females is 40.4. When you compare this to median age of Iowa, Marshall County is 0.6 years older.
The median income of individuals, in Marshall County, is $24,549 while the average household income is $52,354. When comparing the median income of people living in Marshall County to the rest of Iowa, the average income in Marshall County is $3,072 less.