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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 66F and high of 87F. On average, Joppa gets about 4.45 inches of precipitation in July. Most residents are home owners (82%), have a post secondary degree (47%) and are married, no kids (35%).