As of 1 January 2017:

• The three municipalities of Sandefjord (0706), Andebu (0719) and most of Stokke (0720) were merged to a new municipality, Sandefjord (0710).
• The balance of the area of Stokke (0720), of 3 km² and 2,200 persons, was transferred from Stokke (0720) to Tønsberg (0704).

As of 1 January 2018:

• The counties Sor-Trøndelag (16) and Nord-Trøndelag (17) have merged into Trøndelag (50).
• County Trøndelag (50) has expanded, since it now contains the former municipality  Leksvik (1718).
• Municipalities have merged (citation):
• Holmestrand (0702) and Hof (0714) are now Holmestrand (0715).
• Larvik (0709) and Lardal (0728) are now Larvik (0712).
  
• Nøtterøy (0722) and Tjøme (0723) are now Færder (0729).
• Rissa (1624) and Leksvik (1718) are now Indre Fosen (5054).
• And possibly Trondheim (1601), Steinkjer (1702), and Stjørdal (1714).

In response:

• We have created a new geo code for Trøndelag (50): INOR_TRN.

References

• Nye kommuner og navn: Oversikt over kommunesammenslåinger og nye kommunenavn (New municipalties and names: Overview of municipal mergers and new municipalities)
• Kommunekatalog: Endringer i de regionale inndelingene (Municipal catalog: Changes in regional sections, 1999 to 2018)

See also

• New Data: Norway Subnational - Summary (Jun. 2012)