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As of 1789, the Principality of Blankenburg was surrounded by (from the north clockwise): Brandenburg (County of Stolberg-Wernigerode and Principality of Halberstadt), Anhalt-Bernburg, Brandenburg (County of Hohnstein), and Brunswick-Grubenhagen.
The Stolberg lands, which were located mostly east of the Harz, included Stolberg, Hayn, the lower County of Hohnstein (1417), as well as Kelbra and Heringen (1413/17), the two latter territories being ruled alongside the House of Schwarzburg.