The collection is split between the museum's two sites, Holy Trinity Church in Dalston, London, and Wookey Hole in Somerset, England.

[2] The museum was established in 1959 in Dalston and the collection was split into a venue in Wookey Hole in 2007.

The Dalston museum is situated in what was the vestry of the Holy Trinity Church.

[4] The Wookey Hole museum is run by Gerry Cottle, vice president of Clowns International.

[6] The egg gallery was created to forestall the possibility of accidental or intentional plagiarism: an unofficial rule prohibits any two clowns from sharing a single face paint design, with eggs providing a suitably head-shaped mannequin.