The current campus of Montgomery Blair High School covers forty-two acres between the Capital Beltway, U.S. Route 29, and Maryland Route 193 in Silver Spring's Four Corners neighborhood. The school contains of space and was originally designed for 2,830 students. Eight years after its completion, the school was more than 500 students over capacity, with a population of about 3,400. As a result, the school at one point had eight auxiliary portable classrooms. Population has decreased slightly due to the opening of other schools and the Downcounty Consortium, and as a result 2 portables were removed at the beginning of the 2006–2007 school year. As of April 2010, the enrollment at Blair is 2,788, and the portable classrooms have been removed. Blair remains the county's largest school.