Maryland Route 170 (MD 170) is a state highway in the U.S. state of Maryland. The state highway runs from MD 175 in Odenton north to MD 2 in Brooklyn Park. MD 170 connects the western Anne Arundel County communities of Odenton and Severn and the North County communities of Linthicum, Pumphrey, and Brooklyn Park with Baltimore/Washington International Thurgood Marshall Airport (BWI Airport). The highway connects BWI Airport with Interstate 695 (I-695) and MD 100 and forms part of the Airport Loop, a circumferential highway that connects the airport and I-195 with many airport-related services.