[3] Ridley Township contains the (CDPs) of Folsom and Woodlyn, along with the unincorporated communities of Crum Lynne and Holmes and a portion of Secane.

[4] The first mention of Ridley in court records is from 1684 when tax collectors were appointed for the township.

George Washington moved his troops through Ridley Township on his way to Wilmington, Delaware to oppose General Howe.

After the Battle of Brandywine, Continental Army soldiers camped along the road in Ridley and George Washington spent the night in the home of John McIlvain.

On November 19, 1777, General Cornwallis marched 3,000 men from Philadelphia through Ridley township.

It was reported that the "men robbed the inoffensive people on the route without mercy, taking food from the indigent widow as remorselessly from the wealthy husbandman."

The unincorporated communities of Folsom, Secane and Woodlyn occupy the central and western parts of the township, respectively.

[15] In 2018, as a fire had affected the classroom area, the students were temporarily housed at Cardinal O'Hara.

Pennsylvania Route 291 follows Industrial Highway along a southwest–northeast alignment through the southeastern corner of the township.

Finally, Pennsylvania Route 420 follows Kedron Avenue along a northwest–southeast alignment through the northeastern portion of the township.

SEPTA Regional Rail's Media/Wawa Line briefly passes through the northern portion of the township while SEPTA Regional Rail's Wilmington/Newark Line that follows Amtrak's Northeast Corridor briefly passes through the southern portion of the township; however, the nearest train stations are in neighboring municipalities.