Hinterrhein District
Hinterrhein District is a former administrative district in the canton of Graubünden, Switzerland. It had an area of and had a population of 13,179 in 2015. Much of the district became part of the Viamala Region on 1 January 2017 as part of a reorganization of the Canton.
Hinterrhein District consisted of five Kreise and twenty-four municipalities. This number decreased from thirty-two when the municipalities of Portein, Präz, Sarn, and Tartar merged on 1 January 2010 into Cazis. It decreased further in 2015 when Almens, Paspels, Pratval, Rodels and Tomils merged to form the new municipality of Domleschg.
| Municipality | Population | Area |
| Avers | 93.07 |
| Municipality | Population | Area |
| Domleschg | ||
| Fürstenau | 1.30 | |
| Rothenbrunnen | 3.10 | |
| Scharans | 14.28 | |
| Sils im Domleschg | 9.32 |
| Municipality | Population | Area |
| Hinterrhein | 48.38 | |
| Nufenen | 28.07 | |
| Splügen | 60.53 | |
| Sufers | 34.56 |
| Municipality | Population | Area |
| Andeer | 30.46 | |
| Casti-Wergenstein | 25.59 | |
| Donat | 4.67 | |
| Ferrera | 75.46 | |
| Lohn | 8.14 | |
| Mathon | 15.12 | |
| Rongellen | 2.04 | |
| Zillis-Reischen | 24.46 |
| Municipality | Population | Area |
| Cazis | 31.2 | |
| Flerden | 6.06 | |
| Masein | 4.19 | |
| Thusis | 6.84 | |
| Tschappina | 24.67 | |
| Urmein | 4.35 |
Mergers
- On 1 January 2003 the municipalities of Donath and Patzen-Fardün became part of Donat.
- On 1 January 2006 Medels im Rheinwald became part of Splügen.
- On 1 January 2009 Tomils was created through the merger of Feldis/Veulden, Scheid, Trans and Tumegl/Tomils.
- On 1 January 2010 Portein, Präz, Sarn and Tartar merged into Cazis.
- On 1 January 2015 Almens, Paspels, Pratval, Rodels and Tomils merged to form Domleschg.