The present municipality was formed in two steps during the last nationwide local government reform in Sweden.

In 1967 the market town (köping) Smedjebacken was reunited with Norrbärke from which it had been detached in 1918.

Also close by is Lernbo where the biggest sportsfishing retailer in Europe has its headquarters.

This is a demographic table based on Smedjebacken Municipality's electoral districts in the 2022 Swedish general election sourced from SVT's election platform, in turn taken from SCB official statistics.

[3] In total there were 10,924 residents, including 8,649 Swedish citizens of voting age.