Like Alaska’s boroughs, its census areas are designated as county equivalents. I don’t think we should tag the census areas as boundary=administrative, as we’ve done for Connecticut’s planning regions, because the Unorganized Borough should be represented by the absence of those. However, the census areas are pretty clearly more important to map than CDPs. I’d suggest either boundary=census or the more generic boundary=statistical plus border_type=census_area. That also happens to be what OpenHistoricalMap has done with, for example, the Chugach Census Area.
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