Lansdale is a borough in Montgomery County, Pennsylvania, northwest of Philadelphia. It is a densely-populated commuter town, with many residents traveling daily to Philadelphia using SEPTA Regional Rail's Lansdale/Doylestown Line. In 1900, 2,754 people lived here; in 1910, 3,551; and in 1940, 9,316 people were inhabitants of Lansdale. The population was 16,269 at the time of the 2010 census.
Lansdale is the center of the North Penn Valley, a region which includes the surrounding townships and boroughs.