The unincorporated community of Mainville is in the center of the township. 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. Geography Fisher Run Road looking north in Main Township In 1815, a charcoal-iron furnace was built in the township. The main historical industry in Main Township was the iron industry.

Main Township was settled by settlers of European descent in 1772, at which time the township was part of Berks County.

By this time, several settlers had arrived and settled in the township. In 1808, Reading Road was created and passed through Main Township, allowing easier access to it. The Pennsylvania Railroad once passed through the township. The area that is now Main Township was part of Augusta Township, then Catawissa Township until 1799, and part of Mifflin Township until January 1844. The iron industry was once preeminent in the township. Main Township was settled in 1772 and incorporated in 1844. The population was 1,272 at the 2020 census. Main Township is a township in Columbia County, Pennsylvania.

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