About 8482 Sennhof (Winterthur)
Illnau-Effretikon is a municipality in the district of Pfäffikon in the canton of Zürich in Switzerland. It includes the villages of Illnau, Effretikon, Ottikon and Bisikon. On 1 January 2016 Kyburg and Illnau-Effretikon merged to form the municipality of Illnau-Effretikon.
- Canton
- Zurich
- Area
- 32.9 km²
Population
17'756residents
Median taxable income
CHF 67'085
Vacancy
0.98%
Foreign residents
29.3%
Dwellings
8'571
Jobs (FTE)
6'954
Tax multiplier
113%
Land use across the commune
Every 100 × 100 m of 8482 Sennhof (Winterthur), coloured by how it's used. Drawn from the BFS Arealstatistik 2025 release — the most recent nationwide snapshot.
Source BFS Arealstatistik
Loading statistics …
Jobs & economy
6'954 full-time-equivalent jobs across 1'048 businesses — services make up 71% of employment, industry 25% (2018).
Source BFS STATENT
6'954FTE total
Primary3.3%
Secondary25.3%
Tertiary71.4%
Land use
15% built-up, 47% agricultural, 37% forest. Measured across 3'290 hectares (2018).
Source BFS Arealstatistik
Settlement15.5%
Agriculture47.1%
Forest37.4%
Water0.0%
Election Results
SVP led the 2023 National Council election with 32.2%, ahead of SP at 19.2%.
Source BFS
SVP32.2%−0.2 pp
SP19.2%+3.1 pp
FDP11.4%−1.0 pp
GLP10.7%−1.6 pp
Mitte9.7%
Grüne7.5%−3.3 pp
EVP3.5%−0.1 pp
Others
3.0%
2023 vs 2019
Primary / second-home mix
93.0% of dwellings are primary residences; 7.0% are second homes (2026).
Source BFS
Primary residences93.0%
Second homes7.0%
Climate data
Annual mean 9.8°C with 1'108 mm of rain. Warmest in July (19.0°C), coldest in January (0.9°C). Station: Zürich / Fluntern, 556 m.
Source MeteoSchweiz
9.8°C
Annual mean
Mean 9.8°C
Rain 1108 mm
Sun ≈141 days
Zürich / Fluntern · 556 m.a.s.l. · 1991–2020 normals
Warming trend
Mean annual temperature at Zürich / Fluntern has risen by +2.2°C between the first 30 observed years (1864–1893) and the most recent (1996–2025).
Source MeteoSchweiz NBCN
+2.2°C
mean 1996–2025 vs. 1864–1893
Zürich / Fluntern · 556 m.a.s.l. · 1864–2025
