The Bi-Urban Condominium (see above), or Bergedorf, respectively, its capital and the seat of its postal service "Beiderstädtische Post" (Bi-Urban Mail), founded on 1 April 1847, is of note to philatelists because it issued its own postage stamps between 1861 and 1867. According to the census of March 1863 the Bi-Urban Condominium had a population of 12,468 souls, of which 2,957 lived in Bergedorf city (the rest lived in the other five municipalities of the condominium), making it by far the German territory with the smallest population to issue stamps.