Henderson Township is a township which is located in Huntingdon County, Pennsylvania, United States. The population was 923 at the time of the 2020 census.

This township includes the village of Ardenheim.

The Pennsylvania Canal Guard Lock and Feeder Dam, Raystown Branch was listed on the National Register of Historic Places in 1990.

According to the United States Census Bureau, the township has a total area of 26.0 square miles (67 km), of which 25.9 square miles (67 km) is land and 0.1 square miles (0.26 km) (0.50%) is water.

All municipalities listed are in Huntingdon County unless otherwise noted.

• Mill Creek borough
• Huntingdon borough
• Brady Township
• Union Township
• Juniata Township
• Smithfield Township
• Oneida Township
• Miller Township

Historical population

Census	Pop.	Note	%±
2000	972		—
2010	933		−4.0%
2020	923		−1.1%
2022 (est.)	913		−1.1%
U.S. Decennial Census

As of the census of 2010, there were 933 people and 394 households within the township.

The population density was 35.9 inhabitants per square mile (13.9/km). There were 544 housing units at an average density of 20.9/sq mi (8.1/km).

The racial makeup of the township was 99.14% White, 0.32% African American, 0.11% other races, and 0.43% from two or more races. Hispanic or Latino of any race were 0.43% of the population.

There were 394 households, out of which 25.4% had children under the age of eighteen living with them; 64.3% were married couples living together, 5.6% had a female householder with no husband present, and 25.8% were non-families. 22.5% of all households were made up of individuals, and 7.8% had someone living alone who was sixty-five years of age or older.

The average household size was 2.46 and the average family size was 2.85.

In the township the population was spread out, with 19.0% under the age of eighteen, 2.0% from eighteen to nineteen, 3.4% from twenty to twenty-four, 8.7% from twenty-five to thirty-four, 20.5% from thirty-five to forty-nine, 29.0% from fifty to sixty-four, and 17.4% who were sixty-five years of age or older.

The median age was forty-one years. The population was 50.70% male, and 49.30% female.

• Media related to Henderson Township, Huntingdon County, Pennsylvania at Wikimedia Commons

40°29′00″N 77°57′59″W / 40.48333°N 77.96639°W / 40.48333; -77.96639