 The per capita income for the county was $31,346.About 4.90% of families and 7.80% of the population were below the poverty line, including 7.80% of those under age 18 and 5.30% of those age 65 or over.As of the 2010 United States Census, there were 21,376 people, 8,823 households, and 5,575 families in the county.