The boxer Erik Agren was born here The municipality consists of the old towns of Strängnäs and Mariefred and the villages of Åkers styckebruk and Stallarholmen.

Its location on the shores of Lake Mälaren has made Strängnäs an important trading centre and meeting place through the ages.

Mariefred acquired its name from the monastery Pax Mariae ("Mary's Peace") which was founded some 500 years ago by Sten Sture the Elder.

Strängnäs has a multifaceted and dynamic economy, being home to businesses of different sizes and in many different sectors.

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.