A few kilometers north of the territorial entity of Pachten the Saar unites with the Nied coming from Lorraine.

The rectangular plaice is stretched towards southeast-northwest and bounded to the south by the Carboniferous line of the municipalities of Ensdorf, Hülzweiler and Schwarzenholz.

On this bas-relief with overlaying younger gravel blankets, the development area of Dillingen and Pachten spreads.

Above is the upper Buntsandstein (Röt Formation), which is made up of firmer sandstones bound to parts of clay or carbonate.

The different altitudes of these terraces bear testimony to different stages of the depression of the two rivers and the deposit of entrained crushed stones.

The firmer sandstones of the upper Buntsandstein (Röt Formation) provided breakage and quarry stones.

The Kiel weather station has recorded the following extreme values:[9] The city of Dillingen has six neighboring municipalities.

The importance of the Dillingen-Wallerfangen area on both banks of the middle Saar in the prehistoric and early historic eras is attested by a number of finds: rich bronze caskets of the late Urnfield period (9th century BC), a multi-tiered partial defensive wall (de:Abschnittsbefestigung) of the Hallstatt culture (8th-6th century BC) on the nearly 389 metres (1,276 ft)-high, peninsula-like massif of the Limberg overlooking the Saar,[11] and a cemetery with a "princely" grave containing a golden torc and arm rings from late Hallstatt period (around 500 BC).

The Gallo-Roman settlement of Contiomagus stood at the intersection of the highways from Metz-Mainz and Trier-Straßburg in today's district of Pachten.

The oldest written mention of "Dillingen" and "Pachten" can be found in a document of Albero von Montreuil, Bishop of Trier (1131–1152).

In 1685, the feudal ruler of Dillingen received permission from King Louis XIV of France to build an ironworks, the Dillinger Hütte.

In 1947 Dillingen became part of the Saarland, which, in 1957, joined the Federal Republic of Germany politically and on 5 July 1959 also economically.

In 1949, Dillingen was granted city rights by the Saar state government under Prime Minister Johannes Hoffmann.

The City Council with 39 seats after local elections on 25 May 2014[12] Blazon: In blue a growing silver, pinned and black grooved wall, surmounted by a silver, gold-crowned and -supported and red-tongued seated Lorraine eagle, in the wall a tall, red-lined golden gate, covered with a red zigzag bar, surmounted by a three-rowed, blue tournament collar.