| Flag | Member monarchy | Year joined | Notes |
|---|
 | Duchy of Anhalt-Bernburg | 11 Apr 1807 | (700) |
 | Duchy of Anhalt-Dessau | 11 Apr 1807 | (700) |
| | Duchy of Anhalt-Köthen | 11 Apr 1807 | (700) |
 | Duchy of Arenberg | 12 Jul 1806 | Co-founder; mediatized 13 December 1810 (379 of 4,000) |
 | Principality of Hohenzollern-Hechingen | 12 Jul 1806 | Co-founder (97 of 4,000) |
| | Principality of Hohenzollern-Sigmaringen | 12 Jul 1806 | Co-founder (193 of 4,000) |
 | Principality of Isenburg | 12 Jul 1806 | Co-founder (291 of 4,000) |
 | Principality of Leyen | 12 Jul 1806 | Co-founder; former countship or graviate (29 of 4,000) |
 | Principality of Liechtenstein | 12 Jul 1806 | Co-founder (40 of 4,000) |
 | Principality of Lippe-Detmold | 11 Apr 1807 | (650) |
 | Duchy of Mecklenburg-Schwerin | 22 Mar 1808 | (1,900) |
 | Duchy of Mecklenburg-Strelitz | 18 Feb 1808 | (400) |
 | Duchy of Nassau (Usingen and Weilburg) | 12 Jul 1806* | Union of  Nassau-Usingen and  Nassau-Weilburg, both co-founders (1,680 of 4,000) |
 | Duchy of Oldenburg | 14 Oct 1808 | annexed by France 13 December 1810 (800) |
 | Principality of Reuss-Ebersdorf | 11 Apr 1807 | (400) |
 | Principality of Reuss-Greiz | 11 Apr 1807 | (400) |
 | Principality of Reuss-Lobenstein | 11 Apr 1807 | (400) |
| | Principality of Reuss-Schleiz | 11 Apr 1807 | (400) |
 | Principality of Salm (Salm-Salm and Salm-Kyrburg) | 25 Jul 1806 | Co-founder; annexed by France 13 December 1810 (323 of 4,000) |
 | Duchy of Saxe-Coburg | 15 Dec 1806 | (Saxon duchies total 2,000) |
| | Duchy of Saxe-Gotha | 15 Dec 1806 |
| | Duchy of Saxe-Hildburghausen | 15 Dec 1806 |
| | Duchy of Saxe-Meiningen | 15 Dec 1806 |
| | Duchy of Saxe-Weimar | 15 Dec 1806 |
 | Principality of Schaumburg-Lippe | 11 Apr 1807 | (650) |
 | Principality of Schwarzburg-Rudolstadt | 11 Apr 1807 | (650) |
 | Principality of Schwarzburg-Sondershausen | 11 Apr 1807 | (650) |
 | Principality of Waldeck-Pyrmont | 11 Apr 1807 | (400) |
