 US 11 is the primary north–south surface highway in central Washington County, connecting Hagerstown with Williamsport to the south and Hagerstown Regional Airport to the north.The federal highway was once a major long-distance highway, but that role has been assumed by Interstate 81 (I-81), which parallels US 11 not only in Maryland but for most of its course from Tennessee to Upstate New York.US 11 is maintained by the Maryland State Highway Administration except for the municipally-maintained portions within the corporate limits of Williamsport and Hagerstown.