The following mints should be added to Numista, I have specified exact dates where known. Modern name of city or area has been added in parenthesis where appropriate. To my knowledge all of these mints already has coins originating from them added to the Numista catalog.
Christiania (Oslo), minted coins between 1628 and 1695.
Tunsberg (Tønsberg), known to be active during late 1200s, exact dates are not known.
Gimsøy (Skien), minted coins between 1543 and 1546.
Bergen, known to be active from late 1100s to early 1500s, exact dates are not known.
Nidaros (Trondheim), known to be active from mid 1000s to 1500s, exact dates are not known.
Hamar, known to be active during mid 1000s, exact dates are not known.
In regards to the mint in Kongsberg it is suitable with title change. It has been officially named “The Norwegian Mint” since 2003 when it was sold and thereby lost its status as a royal mint. If it's possible to make it say “Royal Norwegian Mint” for coins and entries pre-2003 that'd be a preferable solution.