Mayor David Cicilline wants the state to allow cities to assess private colleges $150 per student.
Under his unusual proposal, it would be up to the colleges to decide whether to pay the fee or pass it on to their students.
Cicilline originally suggested cities be allowed to levy a $150-per-semester tax on full-time students at private colleges, but he amended his proposal Wednesday.
The measure is included in legislation that state lawmakers plan to consider.