Altdorf lies two kilometres south of the river Neckar in the foothills of the Swabian Jura.

Adjacent communities are Neckartailfingen to the north, Nürtingen to the Northeast, Großbettlingen to the east, Bempflingen to the south and Neckartenzlingen in the West.

The population figures are census results (¹) or official extensions of the State Statistical Office of Baden-Württemberg, only including Hauptwohnsitze (main domicile).

The first term ended in 2012, though on 29 January 2012 Joachim Kälberer was confirmed for a further eight years in office, following a 97.6% approval rate with a voter turnout of 49.9%.

Blazon : A black Hirschstange (literally 'deer post', and known as the symbol of Württemberg) on a golden chief, below which is a silver ploughshare on blue.