Söderfors () is a locality situated in Tierp Municipality, Uppsala County, Sweden with 1,572 inhabitants in 2010. Year%VotesVSMPCLKDMSDNyDLeftRight1973 93.4 1,736 4.3 70.9 13.5 4.1 2.5 3.9 75.1 21.51976 94.4 1,707 3.1 72.2 10.9 6.5 1.9 5.3 75.3 22.71979 94.6 1,583 3.3 74.9 7.7 6.1 2.3 5.6 78.2 19.51982 92.7 1,544 4.4 76.4 0.5 6.5 2.6 2.0 7.2 80.8 16.31985 92.0 1,478 4.3 78.8 0.1 4.3 6.7 5.6 83.1 16.61988 89.1 1,392 4.0 75.1 2.6 3.9 5.7 2.5 4.7 81.8 14.41991 89.1 1,357 4.3 71.2 1.5 3.4 4.6 4.9 6.4 3.6 75.5 19.31994 89.0 1,294 4.3 76.3 1.6 2.9 3.3 2.6 7.5 0.7 82.1 16.21998 81.6 1,125 10.2 68.9 1.4 2.4 2.2 6.0 7.6 80.5 18.32002 79.1 1,077 6.8 73.0 1.0 2.8 4.3 5.5 5.4 0.9 80.8 17.92006 78.3 1,355 5.4 64.1 2.2 4.9 3.7 4.8 10.7 2.7 71.7 24.12010 81.5 1,399 6.4 58.7 2.2 4.6 3.0 2.9 14.4 6.8 67.3 24.92014 81.7 1,414 5.6 55.3 2.5 4.3 1.9 2.3 9.3 16.8 63.4 17.92018 77.1 1,269 7.5 43.2 1.9 6.9 1.3 3.9 9.4 24.4 59.4 38.1

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