1909 Map of Mount Airy

About this map

Mount Airy sits at the nexus of a complex drainage and transport network where four Maryland counties—Frederick, Carroll, Howard, and Montgomery—converge. Surveyed between 1906 and 1907, this landscape is defined by the winding course of the South Branch Patapsco River and the industrial backbone of the Baltimore and Ohio Railroad. The map captures an era when rural connectivity relied on toll roads like the Poplar Springs Tollgate Turnpike and local economies were anchored by neighborhood milling operations.