NEW YORK (JTA) – Jewish day school enrollment nationwide is up 12 percent from five years ago, primarily due to growth in haredi Orthodox schools.

Nearly 255,000 students are enrolled in 861 Jewish day schools from the 4-year-old level through 12th grade, according to a new census of the schools conducted by the Avi Chai Foundation. The day school survey, which has been conducted every five years since 1998-’99, also found 59 new schools since the last study, in 2008-’09.

The primary drivers of growth have been Chasidic students, who have grown by 110 percent since the first census 15 years ago, and yeshivish (haredi non-Chasidic) schools, which have grown by 60 percent since the 1998-’99 survey.

The challenge is “whether there will be sufficient resources to provide adequately for the growth in these two sectors,” said Marvin Schick, who conducted the survey for Avi Chai.

By contrast, enrollment in non-Orthodox schools has declined. Reform day school enrollment is down 19 percent from five years ago, to 3,704 students nationwide; enrollment in the Conservative movement’s Solomon Schechter schools are down 27 percent from five years ago, to 9,718 students, and nondenominational community day school enrollment has slipped by 2 percent, down to 20,413 students, according to the census. Together, these non-Orthodox schools have just 13 percent of all day school students. In 1998, the proportion was 20 percent.

Overall, the number of Jewish day school students nationwide has grown by 26,437 over the last five years.

The figures were self-reported by every known Jewish day school in America, according to Avi Chai. In all, 37 states and the District of Columbia have Jewish day schools. The primary concentration of Jewish schools are in New York and New Jersey, where day school students number 190,195 – roughly 75 of the nationwide total.