Question: Name the district for reason for change being Died July 4, 1939
SQL: SELECT "District" FROM "1-2160008-4" WHERE "Reason for change" = 'Died July 4, 1939';

Question: Name the number of reason for change on May 11, 1939
SQL: SELECT COUNT("Reason for change") FROM "1-2160008-4" WHERE "Date successor seated" = 'May 11, 1939';