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Tredyffrin Township (Welsh: Tre (town) + Dyffryn (valley)) is a township located in eastern Chester County, Pennsylvania, USA. The population was 29,062 at the 2000 census. Originally settled in the late 17th century, Tredyffrin is bounded by Delaware and Montgomery Counties. It includes on its northern boundary a small part of Valley Forge National Historical Park, where George Washington encamped during the American War of Independence. Tredyffrin and the entire Great Valley region also have many limestone deposits.
Unincorporated communities within Tredyffrin Township include Berwyn, Devon, Paoli, Chesterbrook, Strafford, and part of Wayne. Tredyffrin is bordered by Easttown, East Whiteland, Willistown, Charlestown, and Schuylkill townships.
Geography According to the United States Census Bureau, the township has a total area of 19.9 square miles (51.4 km²), of which, 19.8 square miles (51.4 km²) of it is land and 0.04 square miles (0.1 km²) of it (0.15%) is water.
Demographics As of the census[1] of 2000, there were 29,062 people, 12,223 households, and 7,834 families residing in the township. The population density was 1,464.9 people per square mile (565.6/km²). There were 12,551 housing units at an average density of 632.6/sq mi (244.3/km²). The racial makeup of the township was 90.88% White, 2.84% African American, 0.11% Native American, 5.12% Asian, 0.01% Pacific Islander, 0.29% from other races, and 0.74% from two or more races. Hispanic or Latino of any race were 1.20% of the population.
There were 12,223 households out of which 29.0% had children under the age of 18 living with them, 55.9% were married couples living together, 6.2% had a female householder with no husband present, and 35.9% were non-families. 30.1% of all households were made up of individuals and 9.1% had someone living alone who was 65 years of age or older. The average household size was 2.36 and the average family size was 2.99.
In the township the population was spread out with 23.3% under the age of 18, 4.7% from 18 to 24, 30.1% from 25 to 44, 27.2% from 45 to 64, and 14.7% who were 65 years of age or older. The median age was 40 years. For every 100 females there were 89.9 males. For every 100 females age 18 and over, there were 86.7 males.
The median income for a household in the township was $82,258, and the median income for a family was $105,183. Males had a median income of $76,393 versus $46,124 for females. The per capita income for the township was $47,584. About 2.2% of families and 3.7% of the population were below the poverty line, including 4.6% of those under age 18 and 2.8% of those age 65 or over.
