Martin State Airport is a joint civil-military public use airport located nine nautical miles east of the central business district of Baltimore, in Baltimore County, Maryland, United States. The facility is located within the census-designated place of Middle River on Maryland State Highway 150, near the intersection of Maryland State Highway 700. The Maryland Aviation Administration operates the airport on behalf of the Maryland Department of Transportation. MTN is a general aviation relief airport.

Middle River is an unincorporated community and census-designated place in Baltimore County, Maryland, United States. The population was 33,203 at the 2020 census. A Middle River Train Station first appeared on the 1877 G.M. Hopkins & Co Baltimore County Map and by 1898 had a designated Post Office and modest street grid. The town expanded during the 1930s and 1940s and established the "Aero Acres" housing community which borders the railroad tracks and Martin Blvd. to serve as housing for people working at the Martin Aerospace Company. For this development, the architecture firm of Skidmore, Owings & Merrill designed gable-roofed Cape Cod houses with dimensions of 24 feet by 28 feet, featuring large commercial-style windows in their principal rooms. In 1941 a total of 600 homes were built at Aero Acres using this design from Cemento .[2]