In 1/1 1967 the town of Karlshamn was united with Asarum, Hällaryd och Mörrum to form the present municipality when all local government units in Sweden became municipalities of unitary type..

There are 6 urban areas (also called a Tätort or locality) in Karlshamn Municipality.

In total, just above 32,000 people live in Karlshamn, which makes it the second largest municipality in Blekinge County.

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

The council also derives income from the municipal harbour, the energy services etc.