Lansdowne is a borough in Delaware County, Pennsylvania, United States, located 6 miles (10 km) southwest of Center City Philadelphia.

[4] It is bordered to the southeast by Yeadon, to the southwest by Clifton Heights, and to the north, east, west, and south by Upper Darby Township.

According to the United States Census Bureau, the borough has a total area of 1.2 square miles (3.1 km2), all land.

[3] Darby Creek, a tributary of the Delaware River, forms the southwestern and southern borders of the borough.

Saint Philomena School of the Roman Catholic Archdiocese of Philadelphia operated for over 100 years[citation needed] before closing in 2011 due to a decrease in the number of students.

The Delco Times stated that had the school remained open, it would have had to reduce enrichment services.

The Farmers Market runs, rain or shine, on Saturdays from 9 am to 1 pm, between Memorial Day and Halloween.

Lansdowne is also the site of the Delaware County Healthcare Clinic[19] to treat addiction, run by Recovery Centers of America.

A community of Scottish weavers lived and worked on Scottdale Road by the Darby Creek in the 19th century.

Building contractors used the tailings in mortar for the construction of walls and foundations in houses and businesses built nearby.

The U.S. Environmental Protection Agency (EPA) checked thousands of properties in a 12.5 mile radius of the original contaminated site through usage of a van loaded with radiation detection instrumentation.

In 1995, the EPA and the U.S. Army Corps of Engineers partnered to conduct clean-up operations which included dismantling the contaminated W.L.

[24] A University of Pennsylvania professor, Dicran Kabakjian, developed the radium enrichment process for W.L.

[26] The processing activities in the basement resulted in radium contamination of the house and nearby properties.

The Media–Sharon Hill Line is immediately adjacent to the borough along Garrett Road in nearby Upper Darby Township