Siegen Siegen is a city in Germany, in the state of North Rhine-Westphalia. The center of the Siegen-Wittgenstein district of the Arnsberg administrative district. Population - 103 555 inhabitants. The Sieg River flows through the city. IKEA Siegen 0.0 /5 rating (0 votes) Wallhausenstrasse 60 57072, Siegen Details