The original entity Tranås was detached from the rural municipality Säby as a market town (köping) in 1882 and made a city in 1919. The reunification took place in 1951 when Säby was made a part of Tranås. In 1967 Linderås was amalgamated with the City of Tranås, which in 1971 was made a municipality of unitary type when all differences between rural and urban municipalities were abolished.

There are 3 urban areas (also called a Tätort or locality) in Tranås Municipality.

In the table the localities are listed according to the size of the population as of December 31, 2005. The municipal seat is in bold characters.

Tranås was once well known for its fur industry, but there is almost no such activity today.

Music plays an important part of everyday life in Tranås. There are bands such as Rövsvett, El Scorschos, The Trick and Feel Flows. Tranås as a town still holds itself in high esteem since winning the annual national award as "music municipal of the year", despite the politicians trying their best to shut down important meeting places like Sobelhuset and be very anti-rock band in their stance.

Nowadays the best known band from Tranås is The Bombdolls, a punk rock band that regularly tours in Sweden and Germany.

Coordinates: 58°02′N 14°58′E / 58.033°N 14.967°E / 58.033; 14.967

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