|Elevation||1,112 ft (339 m)|
|Area||4.7 sq mi (12.2 km2)|
|- land||4.7 sq mi (12.2 km2)|
|- water||0.0 sq mi (0 km2), 0%|
|Density||281 /sq mi (108.5 /km2)|
|Incorporated||June 7, 1876|
|- summer (DST)||EDT (UTC-4)|
|School District||Quaker Valley|
Location of Aleppo Township in Allegheny County
Location of Aleppo Township in Pennsylvania
Location of Pennsylvania in the United States
Aleppo Township was incorporated as a township in June 7, 1876, from the western section of Kilbuck Township. It was part of the Depreciation Lands reserved for Revolutionary War veterans. Sparse settlement occurred in the 1800s, and Aleppo Township lost land that formed the boroughs of Sewickley Heights, Glenfield, and Haysville.
As of the census of 2000, there were 1,039 people, 483 households, and 298 families residing in the township. The population density was 573.5 people per square mile (221.6/km²). There were 509 housing units at an average density of 281.0/sq mi (108.6/km²). The racial makeup of the township was 95.48% White, 3.08% African American, 1.06% Asian, 0.10% from other races, and 0.29% from two or more races. Hispanic or Latino of any race were 0.96% of the population.
There were 483 households out of which 22.6% had children under the age of 18 living with them, 50.1% were married couples living together, 9.3% had a female householder with no husband present, and 38.3% were non-families. 34.4% of all households were made up of individuals and 12.2% had someone living alone who was 65 years of age or older. The average household size was 2.15 and the average family size was 2.78.
In the township the population was spread out with 19.1% under the age of 18, 3.9% from 18 to 24, 26.3% from 25 to 44, 30.0% from 45 to 64, and 20.7% who were 65 years of age or older. The median age was 46 years. For every 100 females there were 90.6 males. For every 100 females age 18 and over, there were 85.7 males.
The median income for a household in the township was $59,167, and the median income for a family was $66,667. Males had a median income of $45,192 versus $40,000 for females. The per capita income for the township was $37,187. About 3.8% of families and 5.0% of the population were below the poverty line, including 11.5% of those under age 18 and 2.0% of those age 65 or over.