Grubenhagen was located around the southwestern edge of the Harz, and included the towns of Osterode am Harz, Herzberg am Harz, Duderstadt, Einbeck and the eastern exclave of Elbingerode.
Principality of Bulgaria | Principality of Ansbach | Principality of Lüneburg | Principality of Auersperg | Principality of Polotsk | Principality of Orange | Principality of Yaroslavl | Principality of Pereyaslavl | Principality of Calenberg | Principality of Lippe | Principality of Grubenhagen | Principality of Sealand | Principality of Piombino | Principality of Kiev | Principality of Catalonia | Principality of Anhalt-Zerbst | Principality of Zeta | Principality of Transylvania | Principality of Lichtenberg | Principality of Hungary | Principality of Halberstadt | Principality of Brunswick-Wolfenbüttel | Tabasaran Principality | Serbian Grand Principality | Principality of Valona | Principality of Ryazan | Principality of Reuss-Greiz | Principality of Reuss | Principality of Nassau-Orange-Fulda | Principality of Marlborough |
Other branches that did not have full sovereignty existed in the Dannenberg, Harburg, Gifhorn, Bevern, Osterode, Herzberg, Salzderhelden and Einbeck.