Runtuna (local pronunciation Runntúna) is a locality situated in Nyköping Municipality, Södermanland County, Sweden with 250 inhabitants in 2010.

Elections Runtuna has an electoral ward part of the Nyköping East constituency. The area covers a larger landmass than Runtuna's locality area, being adjacent to the Runtuna parish and the church that is about northwest of the village. It has also been merged with the electoral district of Ludgo, growing larger during the 1973-2018 period.

Year%VotesVSMPCLKDMSDNDOther1973 95.8 530 3.2 30.8 46.0 5.7 3.6 10.6 0.21976 96.5 544 1.3 32.7 46.1 6.1 2.4 11.2 0.21979 95.7 559 2.9 34.2 37.0 7.3 2.1 15.9 0.51982 95.0 591 1.4 37.1 1.7 34.2 4.1 3.2 18.4 0.01985 93.3 591 2.9 34.3 1.9 31.1 9.3 20.3 0.21988 91.8 598 4.2 30.8 5.7 26.4 8.4 4.0 20.2 0.31991 89.0 599 2.3 27.5 3.3 20.7 6.7 10.2 19.5 9.5 0.21994 90.0 595 5.0 36.5 6.4 20.2 3.9 5.2 20.8 0.3 1.71998 83.1 914 7.9 29.4 4.6 16.8 2.5 15.6 22.5 0.52002 84.7 901 5.3 33.3 5.9 19.1 8.2 13.0 13.5 1.1 0.52006 85.2 941 3.1 28.7 6.5 20.5 4.3 9.4 24.0 1.5 2.12010 87.1 988 3.4 26.2 8.2 13.7 5.5 6.6 29.5 5.1 1.92014 89.1 989 4.3 26.2 6.7 12.8 2.2 5.5 23.9 15.1 3.42018 88.9 1,001 6.1 25.6 4.3 14.0 2.4 7.4 19.4 19.5 1.4

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