NOTE: There is another place named Allerthorpe in the East Riding of Yorkshire.
Swainby-with-Allerthorpe is a civil parish in the Hambleton district of North Yorkshire, England.
A Vision of Britain through Time provides the following description from John Marius Wilson's Imperial Gazetteer of England and Wales (1870-72):
Prior to the nationwide municipal reorganization of 1974, Swainby-with-Allerthorpe was part of Bedale Rural District. Historically, it was located in the ecclesiastical parish of Pickhill in the wapentake of Halikeld.