The borough was settled about 1760 and first incorporated in 1875.

The borough was incorporated by an order of the Perry county court on November 3, 1877.

A fourth borough, Groton (within the town of the same name), was incorporated in 1903.

A fourth borough, Farmington (within the town of the same name), was incorporated in 1901.

The arms continued in use when the borough was incorporated.

A sixth borough, Ridgefield (within the town of the same name), was incorporated in 1901.

The borough was settled in 1873 and incorporated on March 18, 1907.

The borough was officially incorporated on March 7, 1892.

Once the borough of Dormont was incorporated in 1909, at least 30 different streets were given new names.

Following a period of building, the borough was incorporated in 1882, with Charles as the first burgess.