The present municipality was formed in 1971 when "old" Karlsborg was amalgamated with Mölltorp and Undenäs.

The area has been dominated by Karlsborg Fortress and military activity throughout the last centuries.

Tiveden National Park is partly situated within the municipality.

This is a demographic table based on Karlsborg 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 6,959 residents, including 5,557 Swedish citizens of voting age.