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Joppatowne is a census-designated place in southwestern Harford County, Maryland, United States. Serving as a bedroom community for nearby Baltimore, it was established in 1961 as a planned unit development (PUD). The population was 12,616 at the 2010 census, up from 11,391 in 2000.
Joppatowne is covered by the "Joppa" ZIP Code of 21085, and "Joppa" is a designated planning region for Harford County. The Joppa ZIP code (21085) extends 6 miles (10 km) north of Joppatowne, as far as Benson, just south of Bel Air.
The namesake of both Joppatowne and Joppa is the original town of "Joppa". It was a major seaport in American colonial times and the county seat of the original Baltimore County until 1768. Its site is located within the boundaries of present-day Joppatowne.
In colonial America there were three towns in the area of present-day Joppatowne, each established and abandoned in succession: Gunpowder Town, Foster's Neck, and Joppa. The first two were short-lived, but Joppa proved quite successful for some 50 years.