Montgomeryville is a census-designated place in Montgomery Township, Montgomery County, Pennsylvania, United States. The population was 12,624 at the 2010 census. According to a 2010 Forbes magazine/Yahoo.com survey, Montgomeryville ranks 5th in America's top 10 affordable suburbs. It is part of the North Penn Valley region that is centered on the borough of Lansdale. Montgomeryville is located 29 miles southeast of Allentown and 21 miles north of Philadelphia.