- 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)