 About 3.3% of families and 4.9% of the population were below the poverty line, including 5.5% of those under age 18 and 7.8% of those age 65 or over.As of the 2000 United States Census, there were 70,205 people, 24,356 households, and 18,778 families in the county.The population density was 198/sqmi (76.6/km²).