CREATE TABLE table_3604 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" TEXT, "Result" TEXT, "Candidates" TEXT)

First elected in 1807 1817 in what district?
SELECT "District" FROM table_3604 WHERE "First elected" = '1807 1817'
SELECT "District" FROM "table_3604" WHERE "First elected" = '1807 1817'