|Elevation||249 ft (75.9 m)|
|Area||3.9 sq mi (10.1 km2)|
|- land||3.9 sq mi (10 km2)|
|- water||0.0 sq mi (0 km2), 0%|
|Density||773.6 / sq mi (298.7 / km2)|
|- summer (DST)||EDT (UTC-4)|
Thornbury Township is a township in Chester County, Pennsylvania, United States. The population was 3,017 at the 2010 census. It is adjacent to, and was once joined with Thornbury Township, Delaware County, Pennsylvania.
Thornbury Township was organized in 1687 with the appointment of Hugh Durborrow as constable and received its name from Thornbury, in Gloucestershire, England. At the time not more than five or six families lived within the limits of the township. George Peirce, one of the earliest and most influential inhabitants of the township, had a wife who was a native of Thornbury, in England, and the township was purportedly named to compliment her. Thornbury, Birmingham and Westtown townships are the only townships within the present limits of Chester County which were organized before 1704.
The township was divided when Delaware County was separated from Chester County in 1798. As a result, there is a Thornbury Township in each county. Landowners were allowed to choose which county they wished to be in, causing the line between the two townships, and the two counties, to be very irregular.
The Battle of Brandywine, part of the American Revolutionary War took place partially in the town. It was one of Thornbury's citizens, Squire Thomas Cheyney, who informed George Washington, commander of the Continental Army, of the approach of the British troops. 
Points of interest 
Entries in the National Register of Historic Places
According to the United States Census Bureau, the township has a total area of 3.9 square miles (10 km2), all of it land.
As of the census of 2000, there were 2,678 people, 1,023 households, and 734 families residing in the township. The population density was 684.8 people per square mile (264.4/km²). There were 1,095 housing units at an average density of 280.0/sq mi (108.1/km²). The racial makeup of the township was 91.90% White, 2.58% African American, 4.56% Asian, 0.04% Pacific Islander, 0.22% from other races, and 0.71% from two or more races. Hispanic or Latino of any race were 0.78% of the population.
There were 1,023 households out of which 33.6% had children under the age of 18 living with them, 65.6% were married couples living together, 4.2% had a female householder with no husband present, and 28.2% were non-families. 22.6% of all households were made up of individuals and 3.0% had someone living alone who was 65 years of age or older. The average household size was 2.60 and the average family size was 3.10.
In the township the population was spread out with 26.0% under the age of 18, 5.4% from 18 to 24, 34.8% from 25 to 44, 26.7% from 45 to 64, and 7.2% who were 65 years of age or older. The median age was 37 years. For every 100 females there were 95.6 males. For every 100 females age 18 and over, there were 95.6 males.
The median income for a household in the township was $84,225, and the median income for a family was $112,291. Males had a median income of $70,602 versus $42,371 for females. The per capita income for the township was $47,505. None of the families and 1.6% of the population were living below the poverty line, including no under eighteens and 2.0% of those over 64.
Notable Residents 
- Futhey, J. Smith; Gilbert Cope (1881). History of Chester County, Pennsylvania, with Genealogical and Biographical Sketches. Louis H. Everts. ISBN 0-7884-0206-4.
- LL.D. Jordan, John W. (1914). A History of Delaware County, Pennsylvania and its People. New York, NY:Lewis Historical Publishing Company.
- History of Thornbury Township, Pa
- Wood, W.J.; John S.D. Eisenhower (1990). Battles of the Revolutionary War: 1775-1781. Chapel Hill, N.C.: Algonquin Books of Chapel Hill. ISBN 0-306-80617-7.
- "About the Twp.". Retrieved 2006-04-30.
- "National Register Information System". National Register of Historic Places. National Park Service. 2010-07-09.
- PHMC Cultural Resources Database
- GROWTH by BEAUTIFICATION - Cheyney University campus undergoes renovations
- Cheyney Timeline
- Barnard Residence - Philadelphia Architects and Buildings
- Taylor Frazer Ruins
- POLLY FRAZER An Unsung Heroine’s Story
- "American FactFinder". United States Census Bureau. Retrieved 2008-01-31.
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