Rocky Ridge, MD

ZIP code 21778 encompasses Havre de Grace in Harford County, Maryland. This area is home to attractions such as the Susquehanna Museum at the Lock House, Concord Point Lighthouse, and the Havre de Grace Decoy Museum. The zip code also includes the Havre de Grace Maritime Museum and the Havre de Grace Promenade, offering scenic views of the Susquehanna River.