Rocky Ridge, MD

ZIP code 21778 is located in Harford County, Maryland. This area is home to the historic town of Bel Air, the county seat. Notable landmarks in this ZIP code include the Harford County Courthouse, the Liriodendron Mansion, and Ma & Pa Railroad Heritage Village. The town boasts a charming Main Street lined with shops, restaurants, and historic buildings, making it a popular destination for locals and visitors alike.