 In the 2000 Census, Italian Americans make up the largest ancestral group in Staten Island and Long Island, followed by Irish Americans and Polish Americans.Manhattan's leading ancestry group is Dominicans since the 2000 census, followed by Irish Americans, then Italian Americans and more than 200 nationalities are counted, plus comparably large numbers of residents with Dutch, Portuguese, Greek, Russian, and Swedish ancestry.Albany and southeast-central New York are heavily Irish American and Italian American.