1 FCゾントホーフェン

For most of its history the club has been a non-describt amateur side in local Bavarian football. Formed as the football department of local multi sports club TSV Sonthofen, formed in 1863, the team left the mother club in 1984 to play as 1. FC Sonthofen.

In 1988 the club was instrumental in the establishing of the Bezirksoberligas in Bavaria, their introduction being suggested by the club in 1986. Despite this, the club did not initially manage to qualify for the new league it had proposed, taking a decade, until 1998, to do so.

Sonthofen spent its next decade fluctuating between the Bezirksliga Schwaben-Süd and the Kreisliga Schwaben-Süd (1992–95) below it until a league title in the Bezirksliga in 1998 final took it up to the Bezirksoberliga. The club spent the next nine seasons at this level, generally finishing in the upper half of the table. Eventually, in 1998, Sonthofen managed to win the league and move out of the league system of Bavarian Swabia for the first time.

For the first time in the Landesliga Bayern-Süd, 1. FCS came tenth in the league in 2008, while also winning the Schwaben Cup for the first and only time, but going out in the quarter finals of the Bavarian Cup against SpVgg Landshut and thereby missing out on qualification to the German Cup. The following season the club finished in ninth place in the league. The 2009–10 season however proved a setback for the club, finishing 16th and suffering relegation back to the Bezirksoberliga., Back at this level the club came third in 2011, a result that, exceptionally, allowed it promotion back to the Landesliga.

Back in the Landesliga the club came fifth in 2012, a result that allowed it to comfortably qualify for the new southern division of the Bayernliga, where it plays in since the 2012–13 season.