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is a borough in Delaware County, Pennsylvania, United States near the western border of the City of Philadelphia. The borough grew quickly in the early part of the twentieth century when a railroad stop was established near the intersection of Lansdowne Avenue and Baltimore Pike. The borough is primarily residential with a commercial center near the original railroad stop, which stretches for a mile along Baltimore Pike. The borough also contained some light industrial buildings which have been in decline in recent decades. Population in 1900, 2,630; in 1910, 4,066; and in 1940, 10, 837. The population was 11,044 at the 2000 census. Lansdowne is located 5 miles (8 km) southwest of Philadelphia.
According to the United States Census Bureau, the borough has a total area of 1.2 square miles (3.1 km²), all of it land.