Status: Marked north-south.

NHS: Entire length in Maryland.

Associated Secret-Obscure Routes:
806 875

The north-south backbone of Frederick County, US 15 once followed what is now MD 85 south to MD 28 in Licksville, then west to Point of Rocks before its current duplex with US 340, rerouted in November 1970. The Frederick Bypass was built in the 1950s as a pre-Interstate expressway. Prior to a recent exit renumbering, we reverted to the original Frederick Freeway exit numbers (5-9) north of I-70. So where were old Exits 1-4? Buried under I-70's current numbers; exit 1 was Patrick St. swinging westward along US 40's piece, then north on US 15 for old exits 5-9. [Shown in brackets thus.]

North of Frederick, 15 is a wide 4 lane divided highway along the eastern slope of Catoctin Mountain. There is an unsigned Business US 15 (Seton Ave) through Emmitsburg. US 15 becomes a limited-access highway again upon crossing into Pennsylvania north to Gettysburg.

115th Infantry Regiment Memorial Highway, US 15 just south of MD 140, Emmittsburg

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