Agderposten was founded by teacher Jens Svendsen and published for the first time on 1 July 1874.

In 1936 a new team of owners took over; Robert Knudsen, Alv Kristiansen and Liberal Party politician Christian Stray.

[1] In addition to Arendal, where they have their office,[3] it has a significant distribution in the municipalities of Risør, Tvedestrand and Grimstad.

[4] It is published six days a week since 1897,[4] launched its Internet edition in 1998 and introduced the tabloid format in 2004.

Agderposten AS also holds a 92.8% ownership of TV Aust-Agder, 96.4 of Radio Agder, 97.7% of Grimstad Adressetidende, 100% of Lillesandsposten and Vennesla Tidende.