 MD 30 enters the town of Manchester as Main Street as the highway passes by Manchester Valley High School. In the center of town, the highway intersects Westminster Street and York Street; along the latter street is Charlotte's Quest Nature Center. MD 30 meets the northern end of MD 27 (Manchester Road) on the northern edge of downtown and the southern end of MD 86 (Lineboro Road) at the north town limit. There is no direct access from southbound MD 30 to northbound MD 86; that movement is made via Hallie Avenue, the next intersection to the south. MD 30 crosses Dug Hill Ridge just north of MD 86 and passes through the community of Melrose, where the highway intersects MD 496 (Bachmans Valley Road) and Wentz Road. The state highway follows the upper reaches of the South Branch of Gunpowder Falls through a ridge to the river's source before reaching its northern terminus at the Pennsylvania state line. The highway continues as PA 94 (Baltimore Pike) through southwestern York County to Hanover.
