Substitute Teaching in the Montgomery. County Public Schools. Congratulations on your selection as a Montgomery County Public Schools (MCPS) substitute teacher. Substitute teachers are vital to the continuity of the instructional program and are essential to a high-quality education for each student. The material in this. ©1995–2018 Montgomery County Public Schools, 850 Hungerford Drive, Rockville, Maryland 20850 Awareness Programs For College Students Penbroke College Casino Parties by Show Biz Productions…