| Picture | Name | Father | Birth | Marriage | Became Countess | Ceased to be Countess | Death | Spouse |
|---|---|---|---|---|---|---|---|---|
| Theda Ukena | Uko van Oldersum | 1434 | 1453 | 1464 County created | 27 September 1466 husband's death | 17 September 1494 | Ulrich I | |
| Elisabeth of Rietberg | John I, Count of Rietberg | 1475 | 8 July 1498 | 27 September 1466 husband's death | 13 July 1512 | Edzard I | ||
| Anna of Oldenburg | John V, Count of Oldenburg (Oldenburg) | 14 November 1501 | 6 May 1530 | 24 September 1540 husband's death | 10 November 1575 | Enno II | ||
| Katharina of Sweden | Gustav I of Sweden (Vasa) | 6 June 1539 | 1 October 1559 | 1 March 1599 husband's death | 21 December 1610 | Edzard II | ||
| Anna of Holstein-Gottorp | Adolf, Duke of Holstein-Gottorp (Holstein-Gottorp) | 27 February 1575 | 28 January 1598 | 1 March 1599 husband's accession | 24 April 1610 | Enno III | ||
| Juliana of Hesse-Darmstadt | Louis V, Landgrave of Hesse-Darmstadt (Hesse-Darmstadt) | 14 April 1606 | 5 March 1631 | 1 November 1648 husband's death | 15 January 1659 | Ulrich II | ||
| Picture | Name | Father | Birth | Marriage | Became Princess | Ceased to be Princess | Death | Spouse |
|---|---|---|---|---|---|---|---|---|
| Juliana Sophia of Barby-Mühlingen | Albrecht Friedrich, Count of Barby-Mühlingen (Barby) | 14 April 1636 | 7 November 1656 | 4 April 1660 husband's death | 12 May 1677 | Enno Louis | ||
| Christine Charlotte of Württemberg | Eberhard III, Duke of Württemberg (Württemberg) | 21 October 1645 | 10 May 1662 | 6 June 1665 husband's death | 16 May 1699 | George Christian | ||
| Eberhadine Sophie of Oettingen-Oettingen | Albrecht Ernst I, Prince of Oettingen-Oettingen (Oettingen-Oettingen) | 16 August 1666 | 3 March 1685 | 30 October 1700 | Christian Eberhard | |||
| Christine Louise of Nassau-Idstein | George August, Count of Nassau-Idstein (Nassau) | 31 March 1691 | 24 September 1709 | 13 April 1723 | George Albert | |||
| Sophie Caroline of Brandenburg-Kulmbach | Christian Heinrich, Margrave of Brandenburg-Bayreuth-Kulmbach (Hohenzollern) | 31 March 1705 | 8 December 1723 | 12 June 1734 husband's death | 7 June 1764 | |||
| Sophie Wilhelmine of Brandenburg-Kulmbach-Bayreuth | George Frederick Charles, Margrave of Brandenburg-Bayreuth (Hohenzollern) | 8 July 1714 | 25 May 1634 | 12 June 1734 husband's accession | 25 May 1744 husband's death | 7 September 1749 | Charles Edzard | |
| In 1744 East Frisia was annexed to Prussia. | ||||||||