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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 63F and high of 86F. On average, Jarrettsville gets about 4.24 inches of precipitation in July. Most residents are home owners (94%), have a post secondary degree (49%) and are married, no kids (47%).