I think you nailed it. The majority of the northern portion of alaska is going to be oil/gas workers, lumberjacks, and perhaps researchers and native tribes. All of those probably have company barracks, cabins, or if there is a ‘town’ it’s going to be a few hundred yards wide. For the towns, it’s due to the winter, when you almost need to be close to other people in case something goes wrong, because significant help is a long way away in distance and time.