 Per Section 4 of R.A. 4867, the incumbent Davao Province representative was to indicate which of the three new provinces he wished to continue to represent; Rep. Lorenzo Sarmiento chose Davao del Norte, which left the seats for Davao del Sur (together grouped with the chartered city of Davao) and Davao Oriental open for the special elections scheduled for November 14, 1967.Davao Oriental comprised a single congressional district from the second half of the 6th Congress until the end of the 7th Congress.Davao Oriental was represented in the Interim Batasang Pambansa as part of Region XI from 1978 to 1984, and returned one representative, elected at large, to the Regular Batasang Pambansa in 1984.