 About 3.3% of families and 4.4% of the population were below the poverty line, including 5.3% of those under age 18 and 4.1% of those age 65 or over.As of the 2000 United States Census there were 15,536 people, 5,816 households, and 4,327 families residing in the township.The population density was 2,339.6 people per square mile (903.4/km²).