There are 11 urban areas (also called a Tätort or locality) in Nässjö Municipality.

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

This is a demographic table based on Nässjö 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 31,732 residents, including 22,963 Swedish citizens of voting age.

Nässjö has had two sister cities since the 1940s: Brønderslev in Denmark and Eidsberg in Norway.