Wilmington is located north of Boston, off I-93.

Follow the signs to the Sumner Tunnel/Boston. Go through tunnel, keeping in the left lane. Take a right up the ramp to Route 3/Route 93 North to exit 41 (Andover St., Rt. 125). Bear right at the end of the off-ramp. At the first set of traffic signals, take a left onto Ballardvale Street. Immediately take the first right into Ballardvale Park. HMCo's offices are located in the building on your right, Entrance B. Parking is available free of charge.

Take I-93 North to exit 41 (Andover St., Rt. 125). Bear right at the end of the off-ramp. At the first set of traffic signals, take a left onto Ballardvale Street. Immediately take the first right into the office complex driveway. HMCo's offices are located in the building on your right. The entrance to the office is located at the end of the building (Entrance B). Parking is available free of charge.

Take I-93 South to exit 41 (Andover St., Rt. 125). Take a left at the end of the ramp and drive across the bridge across I-93. At the first set of lights, take a left onto Ballardvale Street. Take the first right into Ballardvale Park. Houghton Mifflin's office is in the building on the right. The entrance to the office is located at the end of the building (Entrance B). Parking is available free of charge.