There's some debate among county aficionados as to what should be counted. Legally there is only the Unorganized Borough even if it is divided by the Census into statistical areas. There is no government for the UB since law enforcement comes to it from the state. So even though the Census Bureau treats the UB as 10 county-equivalents, they really aren't equivalent in a governmental sense like all other counties. So some county hunters try to visit all 10, and some just any part of the UB. One can even make an argument that any visit to AK counts for the UB since its only unified government is the state.
If you ask all Atlas users to name all Alaskan boroughs and census areas, most would probably fail. The results for that task would be even worse than those for the same task regarding Texas.
It's moreover a pity that new boroughs are created time after time so that comparisons between past election results are hard to draw.
Speaking of county hunters: It must be incredibly hard and grueling and cost-intensive to campaign in Alaska. I assume most Alaskan politicians have never visited each borough/census area.
To some extent VA is just as troubling to county counters. It's relatively common to create and dissolve independent cities. Independent cities are county equivalents, just like parts of the UB in AK.
I think no new jurisdictions were created in Virginia in a while at this point, but 2 independent cities were recently dissolved:
Clifton Forge (Allegheny County), before 2004.
Bedford City (Bedford County), before 2016.
Yes, both AK and VA changed most recently in 2013. Petersburg borough was created and Bedford city reverted to a town in Bedford county as it was before 1968. The last wave of creation in VA was in 1975 IIRC.