Newlin Township, Chester County, Pennsylvania
|Elevation||220 ft (67.1 m)|
|Area||12.0 sq mi (31.1 km2)|
|- land||12.0 sq mi (31 km2)|
|- water||0.0 sq mi (0 km2), 0%|
|Density||107.1 / sq mi (41.4 / km2)|
|- summer (DST)||EDT (UTC-4)|
The township was named for Nicholas Newlin (1630–1699), who received a deed from William Penn. In 1704, his son Nathaniel (1663–1729) and his wife Mary built a water-powered gristmill along the West Branch of Chester Creek. The Newlin Grist Mill is located in Glen Mills, now in Delaware County.
The Embreeville Historic District, Green Valley Historic District, Harlan House, Hayes Homestead, Hayes Mill House, Jacob Hayes House, House at Upper Laurel Iron Works, Indian Deep Farm, Marlborough Village Historic District, Mountain Meadow Farm, Northbrook Historic District, Spruce Grove School, and Joseph Young House are listed on the National Register of Historic Places.
According to the United States Census Bureau, the township has a total area of 12.0 square miles (31 km2), of which 0.04 square miles (0.10 km2), or 0.25%, is water.
As of the census of 2000, there were 1,150 people, 429 households, and 335 families residing in the township. The population density was 96.0 people per square mile (37.1/km²). There were 446 housing units at an average density of 37.2/sq mi (14.4/km²). The racial makeup of the township was 97.04% White, 0.78% African American, 0.43% Asian, 0.17% Pacific Islander, 0.70% from other races, and 0.87% from two or more races. Hispanic or Latino of any race were 2.00% of the population.
There were 429 households out of which 33.8% had children under the age of 18 living with them, 69.9% were married couples living together, 5.6% had a female householder with no husband present, and 21.9% were non-families. 15.4% of all households were made up of individuals and 3.3% had someone living alone who was 65 years of age or older. The average household size was 2.68 and the average family size was 3.00.
In the township the population was spread out with 23.1% under the age of 18, 5.3% from 18 to 24, 27.5% from 25 to 44, 33.5% from 45 to 64, and 10.6% who were 65 years of age or older. The median age was 42 years. For every 100 females there were 102.1 males. For every 100 females age 18 and over, there were 104.2 males.
The median income for a household in the township was $68,828, and the median income for a family was $75,241. Males had a median income of $48,250 versus $37,885 for females. The per capita income for the township was $36,804. About 2.4% of families and 3.5% of the population were below the poverty line, including 0.7% of those under age 18 and 5.0% of those age 65 or over.
- Howard A. Kelly. 1914. Some American Medical Botanists. The Southworth Company,Publishers: Troy, New York, USA. 
- John William Harshberger. 1899. The Botanists of Philadelphia and Their Work. T.C. Davis and Sons: Philadelphia, PA, USA. 
- see www.newlingristmill.org
- "National Register Information System". National Register of Historic Places. National Park Service. 2010-07-09.
- "American FactFinder". United States Census Bureau. Retrieved 2008-01-31.