Ulefoss is a settlement in Nome Municipality, in Telemark, Norway. Ulefoss lies at 26 m above sea level, 0.8 km from the Scandinavian mountains. It has 2,498 inhabitants (2025). The nearest city is Porsgrunn/Skien, 27 km to the east. Among the landmarks around are Old Bø Church (18.5 km), Heddal Stave Church (33 km) and Romnes Church (1.6 km). Among the natural features are Nybufjellet (12.9 km).
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