In 1935 he was elected to Risør city council. After the Second World War he moved to Søndeled and was elected to the municipal council there in 1951, but never took the seat as he got a leading position in his trade union. He served as a deputy representative to the Parliament from Aust-Agder during the term 1950–1953. In 2006 he was awarded honorary membership of his party.
- Walstad, Svein (11 September 2001). "– AP er ikke lenger Gerhardsens parti!". Aust-Agder Blad (in Norwegian). Retrieved 2008-05-06.
- "Sigurd Marcussen" (in Norwegian). Stortinget.no.
- Skarheim, Kjell (28 January 2006). "Markerte 90-års dag i forrykende snøvær". Aust-Agder Blad (in Norwegian). Retrieved 2008-05-06.
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