After slipping briefly into the Bezirksliga (VII), the club returned to the Landesliga, and in 2003 advanced for the first time to the Verbandsliga.

Au had some seasons earlier become the first Bavarian side to play in Baden-Württemberg and Illertissen followed its rival.

The reason for the switch was the introduction of the Regionalliga Bayern, which the club only needed to finish ninth or better in 2011–12 to qualify for.

[4] Illertissen lost after extra time to Werder Bremen in the first round but received a €140,000 starting fee and the gate receipts for the game in prizes.

[5] Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.