Number 3344 in the Roud Folk Song Index. Most of the entries are examples in songsters, popular song books and broadsides, though sets from oral currency are listed at present from Nova Scotia, Tennessee, and Sussex. Various broadside editions can be seen, as Jockey to the Fair, Jockey & Jenny's Trip to the Fair, Jockey and Jenny, and Trip to the Fair, at  Bodleian Library Broadside Ballads:

Jockey to the Fair

It appears that the song was in great vogue in the 1780s, having perhaps first appeared in the preceding decade (Chappell says 1772, but Frank Kidson was unable to verify that date) and was also used as a Country Dance tune. The original tune appears to have been rather more complicated than the form in which it is used for the Morris.