In 1808, Reading Road was created and passed through Main Township, allowing easier access to it.

[3] Main Township is located just south of the center of Columbia County and is bordered to the north by the Susquehanna River, lined by 500-foot-high (150 m) bluffs.

The ridges of Nescopeck Mountain and Catawissa Mountain cross the township just south of Mainville, separated by a water gap formed by Catawissa Creek.

[4] As of the census[5] of 2010, there were 1,236 people, 513 households, and families residing in the township.

There were 490 housing units at an average density of 30.2 per square mile (11.7/km2).

17.7% of all households were made up of individuals, and 6.6% had someone living alone who was 65 years of age or older.

In 1820, Jacob Gensel opened a school in a carding mill on Scotch Run.