In 1971 the City of Arboga was amalgamated with a part of the rural municipality Medåker, forming a municipality of unitary type.

In 1974 the parish Götlanda was added from the dissolved Glanshammar municipality and transferred from Örebro County.

This is a demographic table based on Arboga 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 14,061 residents, including 10,941 Swedish citizens of voting age.

Indicators are in percentage points except population totals and income.