Joppa, Maryland in Harford County, Maryland is now a planning region for the county, but there was originally a town at the center called Joppa. Joppa was founded as a British colonial settlement in the early 18th century, and takes its name from the biblical town of Joppa (Jaffa, Israel).
The town of Joppa on the Gunpowder River traded internationally in agricultural products, especially tobacco. At its peak, the port was home to about 50 homes, a church, prison, inns, shops, schools, armament factories, and warehouses. However, with the rise of Baltimore and Annapolis, Joppa declined as a port, and was slowly abandoned. By 1815, all that remained were ruins, and the surviving Rumsey Mansion.