Scattered archeological discoveries indicate that the land that would become Hornussen was lightly occupied during the Stone Age.

[3] Until the 1802 Act of Mediation, all manor rights to the village were held by collegiate church of Säckingen.

Starting in the 15th century, the Manor of Hornussen had a formal special status within the Habsburg territory.

The lord of the manor was the court of appeals for all of Säckingen and also the economic center of the district.

Thanks to its location on the border to the Bernese Aargau, the village remained largely spared destruction by war, which is why many of the old buildings were preserved.

Besides agriculture, the hospitality industry played a major role in Hornussen starting in the Middle Ages.

Of the rest of the land, 0.82 km2 (0.32 sq mi) or 11.3% is settled (buildings or roads), 0.04 km2 (9.9 acres) or 0.6% is either rivers or lakes.

[4] The municipality is located in the Laufenburg district, in the upper Fricktal (Frick river valley).

[5] The blazon of the municipal coat of arms is Gules a Ploughshare inverted and on a Chief Argent three Mullets of Five of the first in fess.

[9] The age distribution, as of 2008[update], in Hornussen is; 79 children or 8.9% of the population are between 0 and 9 years old and 111 teenagers or 12.5% are between 10 and 19.

[11] About 63.6% 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).

[13] The historical population is given in the following table:[3] The former Säckinger Amtshaus at Hauptstrasse 37 is listed as a Swiss heritage site of national significance.

[15] The entire village of Hornussen is designated as part of the Inventory of Swiss Heritage Sites.