Arosio is a village and former municipality in the canton of Ticino, Switzerland.
In 2005 the municipality was merged with the other, neighboring municipalities Breno, Fescoggia, Mugena and Vezio to form a new and larger municipality Alto Malcantone.[1]
The village comprised the amalgamated settlements Terra di sopra and Terra di sotto.
The historical population is given in the following table:
| Year | Population Arosio |
|---|---|
| 1599 | ca. 300 |
| 1801 | 221 |
| 1850 | 232 |
| 1900 | 186 |
| 1950 | 197 |
| 2000 | 422 |