The City of Fagersta (instituted in 1944) was in 1967 merged with Västervåla parish (which had been part of Surahammar Municipality since 1963).

Another locality of note is Ängelsberg, a village located on Åmänningen Lake.

However, a rapid shift saw the right-leaning coalition narrowly win the 2022 Swedish general election vote in the municipality.

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

Engelsberg Ironworks, in Ängelsberg, is a UNESCO World Heritage Site.