Pen Argyl is a borough in Northampton County, Pennsylvania, north of Allentown, in the Lehigh Valley region of the state. It is part of Pennsylvania's Slate Belt.PopulationIn 1900, 2,784 people lived in Pen Argyl, and in 1910, 3,967 people lived here. The population was 3,595 at the 2010 census.GeographyAccording to the United States Census Bureau, the borough has a total area of, of which 0.71% is water.DemographicsAs of the census of 2000, there were 3,615 people, 1,427 households, and 1,003 families residing in the borough. The population density was 2,603.9 people per square mile (1,004.1/km2). There were 1,506 housing units at an average density of 1,084.8 per square mile (418.3/km2). The racial makeup of the borough was 99.81% White, 0.07% African American, 0.01% Native American, 0.05% Asian, 0.05% from other races, and 0.80% from two or more races. Hispanic or Latino of any race were 1.22% of the population.There were 1,427 households, out of which 36.7% had children under the age of 18 living with them, 53.7% were married couples living together, 12.2% had a female householder with no husband present, and 29.7% were non-families. 24.5% of all households were made up of individuals, and 12.6% had someone living alone who was 65 years of age or older. The average household size was 2.52 and the average family size was 3.01.
