Massachusetts | Massachusetts Institute of Technology | Cambridge, Massachusetts | Massachusetts House of Representatives | Massachusetts General Hospital | Lowell, Massachusetts | Worcester, Massachusetts | University of Massachusetts Amherst | Andover, Massachusetts | Springfield, Massachusetts | Salem, Massachusetts | Medford, Massachusetts | Brookline, Massachusetts | U.S. Route 66 | Newton, Massachusetts | U.S. Route 1 | Williamstown, Massachusetts | Somerville, Massachusetts | Lawrence, Massachusetts | Pan Am Flight 103 | U.S. Route 6 | U.S. Route 101 | Newburyport, Massachusetts | Middlesex County, Massachusetts | Lexington, Massachusetts | Waltham, Massachusetts | Route 66 | Governor of Massachusetts | U.S. Route 30 | Provincetown, Massachusetts |
Originally, Route 103 continued across the river to the junction of Davol Street and Brownell Avenue, where it terminated at Route 138 and Route 6.