Passage: The median income for a household in the county was $35,898, and the median income for a family was $41,631. Males had a median income of $38,688 versus $20,640 for females. The per capita income for the county was $15,032. About 17.80% of families and 22.40% of the population were below the poverty line, including 31.80% of those under age 18 and 15.10% of those age 65 or over.

Question: where is the population?
below the poverty line