One in three public schools were overcrowded in 2012, according to a new audit by the city comptroller.
The report shows enrollment at a third of the city's elementary schools that year was at least 138 percent over capacity.
Those numbers might be under-reported, though, because the Department of Education's official data didn't include students attending classes in trailers until this year.
The audit also finds at least four city schools were more than 200 percent over crowded, with the worst offender being P.S. 319 in Williamsburg, Brooklyn.
The building houses 186 students; it's only meant to hold 78.
Schools Chancellor Carmen Fariña released a statement about overcrowding saying the 2015-2019 capital plan will add tens of thousands of new seats to directly address the issue.