 The constituency was divided between the new Thirsk and Malton division of the North Riding of Yorkshire and the Buckrose division of the East Riding of Yorkshire from 1885.The constituency consisted of parts of the St Leonard's and St Michael's parishes of New Malton in the North Riding until the Great Reform Act of 1832; the borough at that point included 791 houses and had a population of 4,173 in the 1831 census.The Reform Act expanded the boundaries to include the whole of those two parishes, as well as that of Old Malton and of the adjoining town of Norton in the East Riding, increasing the population to 7,192 and encompassing 1,401 houses.