The primary US visas that lead to permanent residency (Green Card) are mainly categorized under the Employment-based (EB-1, EB-2, EB-3, EB-4, EB-5 Investor) and Family-based categories, as well as the Humanitarian (Asylum/Refugee) category. There are also specific temporary US work visas, such as the H-1B visa and the L-1 visa, which create a pathway for permanent residency in the country through employment-based Green Cards.