Rhode Island College to Washington, DC buses and trains from $64

Or, see buses and trains from Washington, DC to Rhode Island College.
Here are some trips other travelers have found on Routefriend.
6h 36m
1 stop
Greyhound Amtrak
5h 54m
0 stops
8h 40m
2 stops
Greyhound Amtrak
9h 52m
1 stop
Amtrak Amtrak