Montgomery Blair High School (MBHS) is a public high school located in Four Corners, Maryland, United States, operated by Montgomery County Public Schools. The school's total enrollment of 3,600 makes it the largest public high school in Montgomery County, as well as Maryland as a whole. Prior to the 2010 U.S. Census the school was within the Silver Spring census-designated place, but as of 2015 it now resides in the newly-designated Four Corners CDP.