The municipality got its present boundaries in 1967, when the City of Strömstad was merged with the two adjacent rural municipalities Tjärnö and Vette.

Strömstad Municipality is located on the Norwegian border and is known to attract large numbers of shoppers from Norway due to the marked price gap, notably in the tax-burdened alcohol and tobacco, but also groceries such as meat and sugar.

This is a demographic table based on Strömstad 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 13,248 residents, including 9,106 Swedish citizens of voting age.

Indicators are in percentage points except population totals and income.