After World War II, Gammelshausen began a period of urban growth that has since the turn of the millennium two areas to the town's southeast established in the 1970s.

[2] The municipality (Gemeinde) of Gammelshausen is located in the district of Göppingen, in Baden-Württemberg, one of the 16 States of the Federal Republic of Germany.

Gammelshausen is physically located in the central foothills [de] of the Swabian Jura.

[2] Gammelshausen's coat of arms shows a red house with one door and three windows below two cherries upon a field of yellow.

This coat of arms was awarded by the Federal Ministry of the Interior on 9 October 1959, along with a corresponding municipal flag.