Capo d'Orlando has a twin city relationship with the City of Fremantle in Western Australia, established due to the cultural and historical links between the cities, and to maintain family associations, trade and tourism.
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In this he was supported by other abolitionists such as his stepson Walter James, by now a prominent lawyer, and former Fremantle mayor Barrington Wood, and opposed by Catholic MLAs Thomas Molloy, Timothy Quinlan and Alfred Canning.
A 21-inch-diameter mounted torpedo dedicated to the memory of United States Navy submariners who died at sea during the Second World War was unveiled by Rear Admiral Herman J. Kossler on 8 September 1967, jointly financed by the City of Fremantle and the United States Submarine Veterans Association.
In 2010 the City of Fremantle received a Lotterywest grant to undertake conservation and interpretation works at the Old Port precinct, including the former Kerosene Store, prior to the 2011 ISAF Sailing World Championships.
Swanbourne was named for Swanbourne House, in Swanbourne, Buckinghamshire, the family seat of Sir Thomas Fremantle (later Baron Cottesloe), a prominent Tory politician, and his brother, Admiral Sir Charles Fremantle, for whom the city of Fremantle was named.