The following chart shows population figures for Siegen's municipal area, however big it was at each given time. Up to 1833, most figures are estimates, and thereafter census figures (¹) or official estimates by the statistical office of the time or the town/city administration itself. The given figures indicate from 1843 the "population present in the town" ("Ortsanwesende Bevölkerung"), from 1925 the "dwelling population" ("Wohnbevölkerung"), and since 1987 the "Population in the place of main residence" ("Bevölkerung am Ort der Hauptwohnung"). Before 1843, population figures come from irregular surveying procedures.