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As of the 2010 United States Census, Kelso, located in the Evergreen State, had a total population of 12,188 people.
From a total population of 12,188, Kelso has a median age of 32.6. The average age of males, in Kelso, is 30.9 while the average age of females is 35.5. When you compare this to median age of Washington, Kelso is 4.8 years younger.
The median income of individuals, in Kelso, is $16,229 while the average household income is $33,492. When comparing the median income of people living in Kelso to the rest of Washington, the average income in Kelso is $15,004 less.