Campaigning for elections from congressional districts seats are decidedly local; the candidates are most likely a part of an election slate that includes candidates for other positions in the locality, and slates may comprise different parties.

The political parties contesting the election make no attempt to create a national campaign.

[citation needed] Party-list campaigning, on the other hand, is done on a national scale.

[citation needed] Reapportioning the number of seats is done via national reapportionment after the release of every census or via piecemeal redistricting for every province or city.

However, as preparations were already on its way when the laws for the creation of General Santos and Southern Leyte districts were made, the commission decided to delay elections for the four seats involved to October 2019; the ballots for those districts showed their previous conflagrations as if it were not redistricted yet.

Upon doing so, the commission then declared the winner of the unified Southern Leyte district as well.

As the 17th Congress has not called for special elections, these seats remain vacant until the sine die adjournment.

The seats held by each party were expected to change by the time candidacies were declared in late 2018.