Oskarshamn Municipality (Oskarshamns kommun) is a municipality in Kalmar County in south-eastern Sweden, where the city Oskarshamn is seat. The amalgamations in the present municipality took place in 1967 when three rural municipalities joined the City of Oskarshamn, which was transformed into a municipality of unitary type in 1971. In 1966 construction started on the first nuclear power plant, OKG, within the present municipality. Since then two more reactors have been built and the plant today produces about 10% of Sweden's electricity. In October 2020 the municipal council voted in favour of the building of Forsmark nuclear waste repository, with the final decision needing to be made by the Swedish government. Oskarshamn was named after King Oscar I of Sweden. The top of the coat of arms show the insignia of the King. In the other fields there are symbols for shipping (the anchor), trade (the staff of Mercury) and wealth (the cornucopia). Its current design stems from 1942, but it basically only differers from the old in the alignment of the symbols. The coat of arms was re-used for the new municipality after 1971 and the arms of Döderhult and Misterhult became obsolete. There are nine urban areas (also called localities, Swedish: tätorter) in Oskarshamn 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.