As part of his ongoing push to build more dormitories, Mayor Marty Walsh is hoping new data will make the case that the city needs a better way to get students out of valuable rental units.

On Thursday, the city released the “Student Housing Trends: 2014-2015 Academic Year’’ report, which paints a detailed picture of the living situations of 148,402 graduate and undergraduate students enrolled in all Boston colleges and universities.

The first major data point is that two-thirds of students live off campus.

But of the almost 100,000 students living off campus in the fall of 2014, the city estimates only about 28,000 of them resided in the private rental market in Boston proper. (Others lived in Greater Boston or in a family-owned home).

Those are the people Walsh’s administration wants to move back on campus, in order to make room for working families.

“One of the priorities of Mayor Walsh’s housing plan is to return 5,000 student-occupied housing units to Boston’s workforce through working with universities to both expand on-campus housing opportunities and by creating off-campus dorms and student villages through public-private partnerships,’’ says the report.

The report also estimated the number of students living in each neighborhood and, not surprisingly, Allston/Brighton and Fenway/Kenmore have the biggest student populations.

More important than the neighborhood is the type of housing Boston’s students are gobbling up. Over half of students residing off campus live in condos or buildings with three or fewer units.

“These students place particular pressure on the workforce housing market, as many properties of three or fewer units were originally built for Boston’s workforce, while condominiums are intended to be owner-occupied housing,’’ the city report explains.

The Walsh administration is pursing a two-pronged approach for getting students out of valuable family housing. One is allowing private developers to build “off-campus dormitories’’ and operate them in tandem with universities, though the details of those partnerships are not made clear in the city’s report.

The other effort is to convince universities themselves to build more dormitories. The city says dorm rooms totaling 1,886 beds are coming by 2018 and that 4,473 more beds are in the planning stages. But 9,497 beds still need to be planned and created by 2030 to meet Mayor Walsh’s goal of 18,500 new student living spots.

The report contains a list of the Boston schools with the most ground to make up. Some schools already have more dorms planned, but as of the fall of 2014, here are the ten schools with the biggest gaps between the number of students and the number of on campus housing slots.