The Lenni Lenappe Indians together with the Iroquois were the first known people in the township. Migration to America began around 1700, with Scotch-Irish immigrants settling in the area now known as Weaversville.
The famous "Walking Purchase" occurred in 1737, and alienated the Indians and the white men. Historical monuments are located within the township describing this act as it happened.
But as the German and English settled, built their homes, and began to work the land, relations with the Indians also improved.
Allen Township, as known today, was originally part of Bucks County. Thirty-seven signers, mostly Scotch-Irish, formed a petition to the Court of Quarter Sessions in Newtown, Bucks County, in June 1748, for the creation of a township. The present metes and bounds were established and finally coordinated in 1752 and 1845, respectively. The name is derived from Chief Justice William Allen of Philadelphia who owned the "Allen Tract" of 5000 acres.
During the 1840's, the township and surrounding areas became predominantly occupied by the German settlers who began not only actively tilling the land, but also providing their needed services to the residents. Kreidersville had tailor and shoe shops, machine and woodworking shops, the general store and a post office. A brickyard and a tannery existed in Wernersville. Blacksmiths, gristmills, coach makers, and physicians also were engaged in providing services and products to the township and adjacent areas.
As of the census of 2000, there were 2,630 people, 1,001 households, and 805 families residing in the township. The population density was 91.6/km² (237.1/mi²). There were 1,030 housing units at an average density of 35.9/km² (92.9/mi²). The racial makeup of the township was 98.67% White, 0.19% African American, 0.08% Native American, 0.08% Asian, 0.04% Pacific Islander, 0.42% from other races, and 0.53% from two or more races. Hispanic or Latino of any race were 1.10% of the population. There were 1,001 households out of which 31.2% had children under the age of 18 living with them, 70.7% were married couples living together, 5.6% had a female householder with no husband present, and 19.5% were non-families. 14.7% of all households were made up of individuals and 5.7% had someone living alone who was 65 years of age or older. The average household size was 2.63 and the average family size was 2.91.
In the township the population was spread out with 21.7% under the age of 18, 6.3% from 18 to 24, 27.5% from 25 to 44, 31.2% from 45 to 64, and 13.3% who were 65 years of age or older. The median age was 42 years. For every 100 females there were 97.4 males. For every 100 females age 18 and over, there were 98.3 males.
The median income for a household in the township was $54,464, and the median income for a family was $59,702. Males had a median income of $41,219 versus $27,930 for females. The per capita income for the township was $23,859. About 1.1% of families and 1.7% of the population were below the poverty line, including 1.6% of those under age 18 and 1.4% of those age 65 or over.
The Township is served by the Northampton Area School District.
Sources: Wikipedia, Allen Township Web Site