Sion
- Canton
- Valais (VS)
- District
- District de Sion
- BFS number
- 6266
- Postcodes
- 1950, 1958, 1962, 1967, 1971, 1991, 1992, 1993, 1994
Population
Official figure
- Permanent residents on 31 December 2010
- 31,673
- Permanent residents on 31 December 2025
- 37,844
- Change 2010–2025
- +19.5%
- Calculated by Votara from official data
Population in 2050?
Votara estimate, not an official forecast canton-level scenario applied proportionally
about 44,100
Estimate for 31 December 2050
How it is calculated
Population 2050 ≈ population 2025 × canton scenario 2050 ÷ canton scenario 2025, rounded to three significant digits.
- Population of Sion, 31 December 2025 (OFS/BFS)
- 37,844
- Valais (canton), OFS/BFS reference scenario 2050
- 435,630
- Valais (canton), OFS/BFS reference scenario 2025
- 373,976
- Growth factor of the canton 2025–2050
- 1.165
The OFS/BFS publishes no population scenarios for communes. This estimate applies the growth of the whole canton to the commune; local factors such as building zones or new housing are not taken into account.
Vacancy rate
Official figure
0.93%
Empty dwellings on 1 June 2026, as a share of all dwellings.
Valais (canton): 1.04% (2026)