John Hayward, Gazetteer of the United States of America.... (Philadelphia: James L. Gihon, 1854), 454.
Middletown, Pa., Dauphin co. Near the junction of Swatara and Susquehanna Rivers. 10 miles S. E. from Harrisburg. The Pennsylvania and Union Canals unite here. The place has an active trade in iron, coal, and lumber.