The school that stands to lose the highest percentage of its teachers is Columbia Secondary School for Math, Science and Engineering in Harlem: 14 teachers, or 70 percent of the 20 it employs. It is a relatively new school, and so employs a large percentage of new teachers, who are the first to be laid off under seniority rules. The largest number of actual layoffs would come from the New Rikers Island School, a high school for jail inmates, which would lose 21 out of 69 teachers.

The list does not reflect the number of teaching positions each school would lose, only the number of teachers who would be laid off. A school like Columbia Secondary might, for example, lose only a couple of teaching positions, but would have to replace roughly a dozen laid-off younger teachers with more senior teachers from elsewhere in the system, a situation principals have resisted because it restricts their ability to choose their own staff.

About 320 schools would see no layoffs, because they have not hired new teachers recently. Some schools, like Public School 130 in Bayside, Queens, and P.S. 57 in the Park Hill neighborhood of Staten Island, have employed the same teachers for many years.

According to the list, the only teachers who would be spared from layoffs are those who teach special education, English as a second language and speech improvement, positions that are harder to fill.

Tom Rochowicz, 28, a global history teacher at Washington Heights Expeditionary Learning School in Manhattan, would most likely be laid off, as would two other teachers at the school. He was hired in September after teaching for two years in California, followed by two years at a charter school in Brooklyn.

“I want to teach for several more years, I want to get on school leadership, but it’s hard to plan your career, it’s hard to plan your future, if you’re going to lose your job,” Mr. Rochowicz said. He is a member of Educators 4 Excellence, a group of current and former teachers, mostly young, who oppose seniority-based layoffs.

At the Yorkville Community School on the Upper East Side, which opened in 2009 to help alleviate crowding in other neighborhood elementary schools, the layoffs would add a complicating layer to the personnel changes that the principal, Samantha Kaplan, will have to enact in the fall.