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Neolithic: Excavation findings suggest that the first settlements date to when the Roman road led from Wels to Lorch (Enns). 6th century: Bavarii settle in the area of Traun.
about 790: The name dru appears on a document for the first time.
about 813 to 824: First mentioning as a place in a document. 1113: First evidence of the former moated castle. 1560: Reconstruction of the castle into a Renaissance building. 1725: Reconstruction of the castle into a Baroque building. 1784: First school in Traun opens. 1785: Fusion with the villages of St. Dionysen and Oedt. about 1850: First industries: Enderlin, Berl and Graumann brothers (textiles), Dr. Feurstein (paper), Gabler (flat and braid products), Enenkel (vinegar factory). 1851: Inauguration of the first Protestant school. 1876: The St. Martin district transferred from the community of Kleinmünchen to Traun. 1882: Construction of the Catholic parish church. 1884: The owner of the castle (count Abensperg-Traun) moves back to the estates in Lower Austria. 1913: Inauguration of the Protestant church. 1915: Inauguration of the new Protestant school. 1965: Lake Oedter See begins to be used for bathing. 1973: Traun, the 'biggest village of Austria' is elevated to a city. The Bundesschulzentrum Traun (home of the 2 high schools Bundesrealgymnasium and Handelsakademie) opens. The building's modern design served as model for schools in the 70s. 1975: The bathing center (Badezentrum) opens with two indoor swimming pools with a sauna and restaurant. Later extended to include an open-air pool, a lawn for sunbathing and an ice-skating rink. 1979: The sports center and stadium (HAKA-Arena) opens. 1982: Firefighters and red cross-center as well as Telegraph office open. 1985: Opening of the New City Hall and the City Gallery. 1991: Introduction of the City Buses. 1997: The new B139 (bypass road) is finished and the Spinnerei (a cultural center for youths) opens. 1999: Redesign of the main square, new ice-skating rink and renovation of the bathing center. 2002: The high school HTL-Traun (Höhere technische Lehranstalt) opens, starting in a provisional building. 2005: Opening of the Traun District Court. 2012: The new building housing the HTL-Traun high school opens.
Traun is located in the economic center of Upper Austria. Notable national and international operating companies are based in Traun, like Internorm, Ed. Haas, Pez, Tannpapier (Trierenberg Holding), Feurstein (Delfort Group), Ing. Voith, C+C Pfeiffer, delfortgroup and Gabler Band.
There are more than 1200 companies in Traun having about 11,000 employees in total.
The Wilhelm Welser Verkehrsbetriebe Traun operates buses on 14 routes in Traun that connect Traun with all neighboring cities and communities. Most routes are serviced by only one single bus and therefore have a frequency of only 1 bus per hour.
On behalf of Traun, Wilhelm Welser also operates four City-Bus routes within Traun at a frequency of 30 minutes.
Linz AG has only one route (line 43) that connects Traun with its network. This route has 5 stops along the north border of Traun and is operated at a frequency of 15 minutes most of the time.