Adams Township is a township in Butler County, Pennsylvania, United States. The population was 11,652 at the 2010 census.
Adams Township is located along the southern edge of Butler County. It is bordered to the west by Cranberry Township and the borough of Seven Fields, at its northwest corner by Jackson Township, to the north by Forward Township and the borough of Callery, at its northeast corner by Penn Township, to the east by Middlesex Township, and to the south by the borough of Valencia, and, in Allegheny County, by Richland and Pine townships. The borough of Mars is completely surrounded by Adams Township but is separate from it.
The busiest roads in the township include PA 228, and the Mars-Evans City Road.
According to the United States Census Bureau, Adams Township has a total area of 22.4 square miles (58.1 km2), of which 0.019 square miles (0.05 km2), or 0.08%, is water.
The township is home to the Mars Primary Center-High School, which is part of the Mars Area School District.
As of the census of 2000, there were 6,774 people, 2,382 households, and 1,917 families residing in the township. The population density was 299.3 people per square mile (115.6/km²). There were 2,544 housing units at an average density of 112.4/sq mi (43.4/km²). The racial makeup of the township was 97.1% White, 0.8% African American, 0.9% Asian, and 0.4% from two or more races. Hispanic or Latino of any race were 0.8% of the population.
There were 2,382 households, out of which 41.5% had children under the age of 18 living with them, 72.0% were married couples living together, 6.0% had a female householder with no husband present, and 19.5% were non-families. 16.1% of all households were made up of individuals, and 4.9% had someone living alone who was 65 years of age or older. The average household size was 2.80 and the average family size was 3.17.
In the township the population was spread out, with 29.9% under the age of 18, 4.8% from 18 to 24, 33.9% from 25 to 44, 23.0% from 45 to 64, and 8.4% who were 65 years of age or older. The median age was 36 years. For every 100 females there were 96.8 males. For every 100 females age 18 and over, there were 98.2 males.
The median income for a household in the township was $65,357, and the median income for a family was $81,340. Males had a median income of $58,906 versus $38,796 for females. The per capita income for the township was $39,204. About 2.4% of families and 3.5% of the population were below the poverty line, including 1.3% of those under age 18 and 5.4% of those age 65 or over.
Adams Township was settled in 1796 and incorporated when it separated from Cranberry and Middlesex townships in 1854.
With the growing population in neighboring Cranberry Township, Adams has had a steady increase in the population of people over the years. After the 2010 census it was discovered that Adams Township had the largest population increase of any township or borough in the county over the previous decade.
The Serbian Orthodox Diocese of Eastern America has its headquarters in the township.