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Jarrettsville is located in Harford County, Maryland. There are roughly 6,675 residents, living in 2,328 households. The average temperature for Jarrettsville this time of the year is low of 50F and high of 74F. On average, Jarrettsville gets about 4.76 inches of precipitation in May. Most residents are home owners (94%), have a post secondary degree (49%) and are married, no kids (47%).