Whitpain Township is a township in Montgomery County, Pennsylvania, United States. Founded in 1701, it has grown to a total population of 18,875 as of the 2010 census. According to the United States Census Bureau, the township has a total area of 12.9 square miles, of which 0.08% is water. Whitpain Township is approximately four and a half …Whitpain Township is a township in Montgomery County, Pennsylvania, United States. Founded in 1701, it has grown to a total population of 18,875 as of the 2010 census. According to the United States Census Bureau, the township has a total area of 12.9 square miles, of which 0.08% is water. Whitpain Township is approximately four and a half miles by three miles. There are two watersheds in the township, Wissahickon Creek and Stony Creek.