From a total population of 24,481, Plainfield has a median age of 38.6. The average age of males, in Plainfield, is 37 while the average age of females is 40.2. When you compare this to median age of Iowa, Plainfield is 0.6 years older.
The median income of individuals, in Plainfield, is $29,632 while the average household income is $61,619. When comparing the median income of people living in Plainfield to the rest of Iowa, the average income in Plainfield is $2,011 more.