 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 to represent Davao del Norte.Davao del Sur (grouped together with Davao City) and Davao Oriental were separately represented beginning in the second half of the 6th Congress after special elections were held on November 14, 1967 to fill their new congressional seats.Davao del Norte — officially renamed to "Davao" in 1972 — was represented in the Interim Batasang Pambansa as part of Region XI from 1978 to 1984.