Columbite occurs in many of the important pegmatite
districts worldwide. It has been found in many locations in Minas Gerais, Brazil, especially at Araçuaí; Governador Valadares; and São José da Safira. Other important worldwide locations include the Tsaramanga pegmatite, Betafo District, Antananarivo Province, Madagascar; and Iveland, Aust-Agder, Norway.
In the U.S., many of the old pegmatite quarries have produced some of the best forms of this mineral. Specific localities include Bethel, Fairfield Co.; Haddam and Portland, Middlesex Co.; South Glastonbury, Hartford Co.; and Woodbury, Litchfield Co. Other U.S. localities include the Ham and Weeks Mine, Wakefield, Carroll Co., New Hampshire; Bedford, Westchester Co., New York; the Rutherford Mine, Amelia, Amelia Co., Virginia; and Spruce Pine, Mitchell Co., North Carolina.