In 1969 the municipality got its present size when "old" Lerum was amalgamated with Skallsjö and Stora Lundby.

[3] Municipal officials and PR staff felt the coat "outdated".

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

[4] In total there were 43,372 residents, including 31,378 Swedish citizens of voting age.

Indicators are in percentage points except population totals and income.