Glenolden is a borough in Delaware County, Pennsylvania, United States. The population was 7,153 at the 2010 census, down from 7,476 at the 2000 census.
Glenolden is located in eastern Delaware County at 39°53′56″N 75°17′33″W (39.898812, −75.292456). It is bordered to east and southeast by the borough of Folcroft, to the southwest by Norwood, to the northwest by Ridley Township, to the north by Darby Township, and to the northeast by Collingdale.
According to the United States Census Bureau, Glenolden has a total area of 0.97 square miles (2.52 km2), all of it land.
As of Census 2010, the racial makeup of the borough was 86.9% White, 8.5% African American, 0.1% Native American, 1.7% Asian, 0.1% Native Hawaiian and Other Pacific Islander, 0.3% from other races, and 2.4% from two or more races. Hispanic or Latino of any race were 2.2% of the population .
As of the census of 2000, there were 7,476 people, 3,058 households, and 1,871 families residing in the borough. The population density was 7,673.6 people per square mile (2,975.8/km²). There were 3,198 housing units at an average density of 3,282.5 per square mile (1,272.9/km²). The racial makeup of the borough was 92.28% White, 4.03% African American, 0.04% Native American, 2.38% Asian, 0.01% Pacific Islander, 0.21% from other races, and 1.04% from two or more races.