North Sewickley Township is a township in Beaver County, Pennsylvania, United States. The population was 5,496 at the 2020 census. It is part of the Pittsburgh metropolitan area. While no clear record has been found it appears that in 1801 North Sewickley Township was created when Sewickley Township was divided into New Sewickley and North Sewi…North Sewickley Township is a township in Beaver County, Pennsylvania, United States. The population was 5,496 at the 2020 census. It is part of the Pittsburgh metropolitan area. While no clear record has been found it appears that in 1801 North Sewickley Township was created when Sewickley Township was divided into New Sewickley and North Sewickley Townships. Sewickley Township ceased to exist at that time.