An estimated 10,000 people in the United States are descendants of Travellers who left Ireland, mostly between 1845 and 1860 during the Great Famine. However, there are no official population figures regarding Irish Travellers in the United States as the US census does not recognise them as an ethnic group. While some sources estimate their population in the US to be 10,000, others suggest their population is 40,000. According to research published in 1992, Irish Travellers in the US divide themselves up into groups that are based on historical residence: Ohio Travellers, Georgia Travellers, Texas Travellers, and Mississippi Travellers. The Georgia Travelers' camp is made up of about eight hundred families, the Mississippi Travelers, about three hundred families, and the Texas Travelers, under fifty families."