 The per capita income for the county was $22,492.About 7.8% of families and 11.4% of the population were below the poverty line, including 13.3% of those under age 18 and 8.3% of those age 65 or over.As part of Yankee-settled Northern Illinois, Henderson County was solidly Whig in its first three elections and then equally Republican from that party's formation until the Great Depression.