Hanover is an unincorporated community in the Baltimore/Annapolis area in northwestern Anne Arundel County and eastern Howard County in the U.S. state of Maryland, located south of Baltimore.

Maryland Route 100 is a major east–west highway connecting U.S. Route 29 in Ellicott City and MD 177 in Pasadena. MD 100 also connects to Interstate 95 (I-95), US 1, the Baltimore–Washington Parkway, and I-97. The highway connects Howard County to the west with Anne Arundel County and the Chesapeake Bay to the east. MD 100 also provides access to the Baltimore–Washington International Airport (BWI) and the Arundel Mills shopping mall.