As of the census2 of 2000, there were 6,588 people, 2,512 households, and 1,929 families residing in the township. The population density was 107.5/km² (278.4/mi²). There were 2,594 housing units at an average density of 42.3/km² (109.6/mi²). The racial makeup of the township was 98.71% White, 0.21% African American, 0.08% Native American, 0.41% Asian, 0.24% from other races, and 0.35% from two or more races. Hispanic or Latino of any race were 0.97% of the population.
There were 2,512 households out of which 32.0% had children under the age of 18 living with them, 65.2% were married couples living together, 7.2% had a female householder with no husband present, and 23.2% were non-families. 18.0% of all households were made up of individuals and 7.8% had someone living alone who was 65 years of age or older. The average household size was 2.62 and the average family size was 2.97.
In the township the population was spread out with 22.7% under the age of 18, 6.9% from 18 to 24, 31.4% from 25 to 44, 27.3% from 45 to 64, and 11.7% who were 65 years of age or older. The median age was 40 years. For every 100 females there were 103.0 males. For every 100 females age 18 and over, there were 101.8 males.
The median income for a household in the township was $50,587, and the median income for a family was $55,332. Males had a median income of $35,340 versus $26,967 for females. The per capita income for the township was $19,980. About 3.5% of families and 5.1% of the population were below the poverty line, including 3.0% of those under age 18 and 10.9% of those age 65 or over.
The Township is served by the Northern Lehigh School District.