Viken has been a member of the Nord-Trøndelag County Council since 1999 and a deputy member of the Storting since 2013. Prior to his election as county mayor in 2007, he chaired the Conservative Party group in the county council for 4 years and the county agricultural board for 12 years.[1][2] He entered politics as a member of the municipal council of Mosvik Municipality in the early 1980s. Viken did not seek his party's renomination to the county council in 2015.[3]