Stuttgart (which later became the capital) was included within the county as a result of the marriage between Ulrich I and Mechthild of Baden in 1251.

Ulrich received the Stuttgart area (Württemberg-Stuttgart), including the towns of Bad Cannstatt, Göppingen, Marbach am Neckar, Neuffen, Nürtingen, Schorndorf and Waiblingen.

Ludwig received the Bad Urach section (Württemberg-Urach), including the towns of Balingen, Calw, Herrenberg, Münsingen, Tuttlingen and Tübingen.

The reigning Count Eberhard VI of Württemberg-Stuttgart was designated as his successor, and was to govern in association with a committee of twelve "honourables", representatives of the country's two estates (lords and commons).

In 1495, under the Imperial Diet of Worms summoned by Emperor Maximilian I, the county became the Duchy of Württemberg.