????-2018
On 1 January 2018, Hoogezand-Sappemeer was merged into the newly created Midden-Groningen.
| Eemsdelta | Groningen | Het Hogeland | Midden-Groningen | Oldambt | Pekela | Stadskanaal | Veendam | Westerkwartier | Westerwolde
Former: (2000–2021) |