After World War II, Altheim, still a haufendorf with two separate town centers, began an urban spread to the west.

[2] Altheim is a municipality (Gemeinde) of the Alb-Donau district of Baden-Württemberg, one of the 16 states of the Federal Republic of Germany.

It is physically located in the Hochsträß [de] region, so named for a historic road that runs through the municipality from west to east.

This coat of arms was first adopted by the municipal council of Altheim on 3 March 1937 with permission from its owner, Baron Conrad von Freyberg, head of a local noble house that had lived in the area since 1528.

On 24 August 1957, the Federal Ministry of the Interior approved the Freyberg coat of arms, but changed the chief to its current state as a reference to Altheim's 13th century owners, the Lords of Steußlingen.