There are 426 municipalities (kommune) in mainland Norway (i.e. excluding Svalbard & Jan Mayen). Identify the most populous of these beginning with each letter of the English & Norwegian alphabets.
There are no municipalities beginning with the letters "C", "Q", "U", "X", "Y" or "Z" in Norway.
To compensate, we include those starting with "Å" & "Ø" from the Norwegian alphabet.
You may answer with the standard English letters "A" and "O" in lieu of above throughout.
Populations are January 2017 estimates by Statistics Norway.