Derradd is one of 35 townlands of the civil parish of Street in the barony of Moygoish in the Province of Leinster.

The townland covers 284.61 acres (1.1518 km2) and the eastern boundary is formed by the River Inny.

The neighbouring townlands are: Clonkeen to the north and west, Lackanwood to the south–east and Hospitalbank and Monagead to the south.

[1][2] The Dublin–Sligo railway line of the national rail company Iarnród Éireann, carrying the Dublin to Longford commuter service and the Dublin to Sligo intercity service,[3] passes through the townland.

The Ordnance Survey map, produced at the time of the Griffith's Valuation survey of Ireland (completed in 1869), shows a junction of two lines.