Northern Virginia schools will welcome back more students than ever on Tuesday morning with tighter budgets and salary freezes.

Officials expect more than 175,000 students to flood Fairfax County schools, an increase of about 3,200 in step with enrollment booms seen across area counties. Much of Fairfax’s growth can be attributed to an influx of young Hispanic families who have children at twice the birthrate of non-Hispanic families in the county, said Larry Bizette, demographer for the school system.