North Wales is a borough in Montgomery County, Pennsylvania, United States. It is a suburb of Philadelphia, and is one of the three historic population centers that make up the North Penn Valley, which is centered around the borough of Lansdale. The population was 3,229 at the 2010 census.Like many small boroughs in Pennsylvania, North Wales is at "build out", meaning that its boundaries have not kept up with population growth. Summarily, many businesses and residences with North Wales addresses are located in outlying townships that were never annexed by the borough, such as the Montgomery Mall in Montgomery Township. North Wales is in the North Penn School District.