The church of S. Antonio Abate was finished in 1526 and became the center of an independent parish in 1792 after it separated from Loco.

After World War II farming and grazing were almost abandoned and replaced by short-term, seasonal emigration.

[4] One notable building in Auressio is the Villa Edera, which was built in 1887, for the Paris impresario Paolo Antonio Calzonio.

[5] After World War II, much of the village population emigrated and sold their properties to outsiders.

Many people who bought houses in Berzona were well known personalities from the arts and culture, such as Alfred Andersch, Golo Mann and Max Frisch.

Today, the village is shrinking as few jobs in farming and grazing remain and most of the working population have moved to Locarno.

From the Middle Ages until the end of the Ancien Régime Loco was the capital of the old Onsernone valley community.

The church is also the home of a Last Supper painting by the Flemish painter Godefridus Maes from 1683.

In addition to the typical houses with balconies, a number of aristocratic mansions are located in the village.

[6] The primary school for the area is located in Loco, along with the Onsernonese Museum (opened 1966) and the renovated retirement home of the Onsernone valley.

Casa Shira (built in the 19th century, now owned by the community) has a small public library and a hostel.

[7] The former municipality is located in the Locarno district, in the Onsernone valley along the Isone river.

The blazon of the municipal coat of arms is Per fess azure and vert a bar wavy argent and overall issuant from base three ribbons or interwoven ending in pall couped in chief.

The new coat of arms symbolizes the merger, each thread of the twisted cord representing a former municipality.

[9] The age distribution, as of 2009[update], in Isorno is; 31 children or 8.8% of the population are between 0 and 9 years old and 28 teenagers or 8.0% are between 10 and 19.

[12] About 59.5% of the total households were owner occupied, or in other words did not pay rent (though they may have a mortgage or a rent-to-own agreement).

[7] The historical population is given in the following table: The Museo Onsernonese is listed as a Swiss heritage site of national significance.

The entire villages of Auressio, Berzona and Loco are listed in the Inventory of Swiss Heritage Sites.

[15] In the 2007[update] Gran Consiglio election, there were a total of 267 registered voters in Isorno, of which 119 or 44.6% voted.