what county is joppa maryland in
Joppa, Maryland. Joppa is a former town and current planning region of Harford County, Maryland. 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.