Reapportionment (redistricting) is carried out by the
Batasang Pambansa (). Voting for
Interim Batasang Pambansa in
1978 was via
multi-member districts based on the then newly established
regions, via
plurality block voting. In January 1984,
a plebiscite asked the voters to revert the Batasang Pambansa's representation via
provinces and
cities, as last seen in 1972. The voters approved the proposal, and the Interim Batasang Pambansa passed Batas Pambansa Bilang () 697 reinstituting representation by province and city. This means the regional at-large districts have been divided as follows: • Division of 12-seat Region I's at-large district to 16 seats •
Abra's at-large district (1 seat) •
Baguio's at-large district (1 seat) • Benguet's at-large district (1 seat) •
Ilocos Norte's at-large district (2 seats) •
Ilocos Sur's at-large district (2 seats) •
La Union's at-large district (2 seats) •
Mountain Province's at-large district (1 seat) • Pangasinan's at-large district (6 seats) • Division of 7-seat Region II's at-large district to 11 seats •
Batanes's at-large district (1 seat) • Cagayan's at-large district (3 seats) •
Ifugao's at-large district (1 seat) •
Isabela's at-large district (3 seats) • Kalinga-Apayao's at-large district (1 seat) •
Nueva Vizcaya's at-large district (1 seat) •
Quirino's at-large district (1 seat) • Division of 16-seat Region III's at-large district to 18 seats •
Bataan's at-large district (1 seat) • Bulacan's at-large district (4 seats) •
Nueva Ecija's at-large district (4 seats) • Olongapo's at-large district (1 seat) • Pampanga's at-large district (4 seats) •
Tarlac's at-large district (3 seats) •
Zambales's at-large district (1 seat) • Division of 20-seat Region IV's at-large district to 19 seats •
Caloocan's at-large district (2 seats) •
Las Piñas–Parañaque's at-large district (1 seat) •
Makati's at-large district (1 seat) •
Malabon–Navotas–Valenzuela's at-large district (1 seat) •
Manila's at-large district (6 seats) •
Pasay's at-large district (1 seat) •
Pasig–Marikina's at large district (1 seat) •
Quezon City's at-large district (4 seats) •
San Juan–Mandaluyong's at large district (1 seat) •
Taguig–Pateros–Muntinglupa's at-large district (1 seat) • Division of 19-seat Region IV–A's at-large district to 24 seats •
Aurora's at-large district (1 seat) • Batangas's at-large district (4 seats) •
Cavite's at-large district (3 seats) • Laguna's at-large district (4 seats) •
Marinduque's at-large district (1 seat) •
Occidental Mindoro's at-large district (1 seat) •
Oriental Mindoro's at-large district (2 seats) •
Palawan's at-large district (1 seat) • Quezon's at-large district (4 seats) • Rizal's at-large district (2 seats) •
Romblon's at-large district (1 seat) • Division of 12-seat Region V's at-large district to 13 seats •
Albay's at-large district (3 seats) •
Camarines Norte's at-large district (1 seat) • Camarines Sur's at-large district (4 seats) •
Catanduanes's at-large district (1 seat) •
Masbate's at-large district (2 seats) • Sorsogon's at-large district (2 seats) • Division of 16-seat Region VI's at-large district to 16 seats •
Aklan's at-large district (1 seat) •
Antique's at-large district (1 seat) •
Capiz's at-large district (2 seats) •
Guimaras's at-large district (1 seat) •
Iloilo's at-large district (5 seats) •
Negros Occidental's at-large district (7 seats) • Division of 13-seat Region VII's at-large district to 15 seats •
Bohol's at-large district (3 seats) •
Cebu's at-large district (6 seats) •
Cebu City's at-large district (2 seats) •
Negros Oriental's at-large district (3 seats) •
Siquijor's at-large district (1 seat) • Division of 10-seat Region VIII's at-large district to 10 seats •
Biliran's at-large district (1 seat) •
Eastern Samar's at-large district (1 seat) •
Leyte's at-large district (5 seats) •
Northern Samar's at-large district (1 seat) •
Samar's at-large district (2 seats) •
Southern Leyte's at-large district (1 seat) • Division of 8-seat Region IX's at-large district to 9 seats •
Basilan's at-large district (1 seat) •
Sulu's at-large district (1 seat) •
Tawi-Tawi's at-large district (1 seat) •
Zamboanga City's at-large district (1 seat) •
Zamboanga del Norte's at-large district (2 seats) •
Zamboanga del Sur's at-large district (2 seats) •
Zamboanga Sibugay's at-large district (1 seat) • Division of 9-seat Region X's at-large district to 10 seats •
Agusan del Norte's at-large district (1 seat) •
Agusan del Sur's at-large district (1 seat) •
Bukidnon's at-large district (2 seats) •
Cagayan de Oro's at-large district (1 seat) •
Camiguin's at-large district (1 seat) •
Dinagat Islands's at-large district (1 seat) •
Misamis Occidental's at-large district (1 seat) •
Misamis Oriental's at-large district (2 seats) •
Surigao del Norte's at-large district (1 seat) • Division of 10-seat Region XI's at-large district to 13 seats •
Surigao del Sur's at-large district (1 seat) •
Davao City's at-large district (2 seats) •
Davao del Norte's at-large district (3 seats) •
Davao del Sur's at-large district (1 seat) •
Davao Occidental's at-large district (1 seat) •
Davao Oriental's at-large district (2 seats) •
Sarangani's at-large district (1 seat) •
South Cotabato's at-large district (2 seats) • Division of 8-seat Region XII's at-large district to 9 seats •
Iligan's at-large district (1 seat) •
Lanao del Norte's at-large district (1 seat) •
Lanao del Sur's at-large district (2 seats) •
Maguindanao del Norte's at-large district (1 seat) •
Maguindanao del Sur's at-large district (1 seat) •
North Cotabato's at-large district (2 seats) •
Sultan Kudarat's at-large district (1 seat) A total of 17 new seats were disputed. The number of sectoral representatives were not changed. ==Results==