The amalgamation during the 1970s' local government reform took place in the area on 1 January 1974, when the former market town Osby (itself instituted as such in 1937) was merged with three adjacent rural municipalities.

In the table the localities are listed according to the size of the population as of 31 December 2005.

This is a demographic table based on Osby 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 13,238 residents, including 9,888 Swedish citizens of voting age.

Indicators are in percentage points except population totals and income.