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Joppa is located in Harford County, Maryland. There are roughly 17,245 residents, living in 6,595 households. The average temperature for Joppa this time of the year is low of 52F and high of 75F. On average, Joppa gets about 4.77 inches of precipitation in May. Most residents are home owners (82%), have a post secondary degree (47%) and are married, no kids (35%).