If in the 2020 census, Hawaii's population grows a good bit, and a third congressional district is needed, where it would be?
Imagine if Hawaii had redistricted after the 2010 census, and then Congress decided to give them a 3rd seat (this has happened before, following the 1870 census),
If Hawaii wanted to preserve the core of its existing districts (or alternatively the core of the incumbent's support) it would let each representative choose 2/3 of his current population. The remaining 1/3 of each would be lumped together into the 3rd open seat.
Alternatively, it could take the Oahu district, HI-1, split it in half and give each half 1/6 of the HI-2. Then fast forward 10 years and adjust the lines.
Based on 2010 numbers, one district would be 86% Neighbor islands, and 14% on Oahu (which is 6.5% of the population of Oahu). So it would likely be on the north shore away from Honolulu. Take the remainder, start in the southeast and continue westward until you reach enough population.
Currently the Neighbor islands have a small majority (57%) of HI-2, but would have 86% of a 3-district plan. In 2014, about 64% of the vote was from the Neighbor Islands (there is a large military presence in Hawaii, and many don't vote vote in Hawaii, or vote at all).
