William S. Canning Boulevard, Rhode Island Avenue, Plymouth Avenue
- Southern Terminus:
- Rhode Island-Massachusetts state line
- Northern Terminus:
- I-195 in Fall River
- 2.61 miles
MA 81 is a short extension of RI 81 into Massachusetts. It becomes a four-lane divided road upon entering the state, has an interchange just over the border with the Fall River Expressway (MA 24), and then continue north for a couple of miles to end at I-195 in Fall River.