Sulz received city rights in 1284 from the Lords of Geroldseck and belonged to the family until 1472 and again from 1519-1534. Since 1534 the city is part of Württemberg. The oldest seal dates from the 13th century and shows the shield of the Lords of Geroldseck, in gold a red bar. Since 1596 the city uses a deer antler, derived from the arms of Württemberg, in the upper part of the shield.
