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|Population||341 (as of December 2004)|
|Area||17.1 km2 (6.6 sq mi)|
|Elevation||678 m (2,224 ft)|
|Cavigliano, Intragna, Maggia, Mosogno, Onsernone|
Isorno is a municipality of the district Locarno in the canton of Ticino in Switzerland. On 10 April 2016 the former municipalities of Isorno, Gresso, Mosogno and Vergeletto merged into the municipality of Onsernone.