Abingdon is a census-designated place in Harford County, Maryland, United States. It lies 25 miles northeast of Baltimore on Maryland Route 7, near the Bush River, between Exits 77 and 80 of Interstate 95. The region is known for its proximity to key attractions such as the Aberdeen Proving Ground, a major U.S. Army facility, and the nearby town of Bel Air, w…Abingdon is a census-designated place in Harford County, Maryland, United States. It lies 25 miles northeast of Baltimore on Maryland Route 7, near the Bush River, between Exits 77 and 80 of Interstate 95. The region is known for its proximity to key attractions such as the Aberdeen Proving Ground, a major U.S. Army facility, and the nearby town of Bel Air, which serves as the county seat of Harford County. Abingdon's location, combined with its historical roots and modern amenities, makes it an appealing place to live for those seeking a balance between suburban comfort and easy access to urban conveniences.