The municipality was created 1967–1971 through the amalgamation of the former City of Södertälje with large rural and suburban areas surrounding it.

Scania AB is a world leading manufacturer of trucks and busses and employed over 9,000 people.

Thus, taken together, Finns and an estimated 120,000 Assyrians in Sweden and account for 40 per cent of the inhabitants of the city.

The results of the Sweden Democrats were not published by SCB between 1988 and 1998 at a municipal level to the party's small nationwide size at the time.

Blocs This lists the relative strength of the socialist and centre-right blocs since 1973, but parties not elected to the Riksdag are inserted as "other", including the Sweden Democrats results from 1988 to 2006, but also the Christian Democrats pre-1991 and the Greens in 1982, 1985 and 1991.