- United States (Portland)
The world's smallest park is Mill Ends Park on a safety island on SW. Front Avenue, Portland, Oregon, USA. The park is a circle of 60.96 cm (24 in) diameter, which is 2,917.15 cm² (452.16 in²) in area. It was designated as a city park on 17 March 1948 at the behest of the city journalist Dick Fagan (USA) for snail races and as a colony for leprechauns.
The park has a small pavement/sidewalk around it for the leprechauns. The page from a typical GWR book is 625.1 cm² (96.9 in²)
It may be the smallest park in the world (according to @GWR), but Portland's tiny @MillEndsPark is big on holiday spirit. 🎄✨ And it's only a short walk from #PortlandState at 56 S.W. Taylor St. 📷 @AstridOnesto pic.twitter.com/AhlnYQzfR6
— Portland State (@Portland_State) December 12, 2018