Jewish Encyclopedia in a long online article ('Sephardim') defines Sephardim as 'descendants of the Jews who were expelled from Spain and Portugal and who settled in southern France, Italy, North Africa, Turkey, Asia Minor, Holland, England, North and South America, Germany, Denmark, Austria, and Hungary.'
'Sephardim - Jewish Virtual Library' (www.jewishvirtuallibrary.org/sephardim) also is a link to a good article by Rebecca Wiener with information drawn from many sources, including Encyclopedia Judaica.