„Party per pale Argent and gules above a hill Or, charged with a pending eight rays star sable ; ahead a pale wavy Or, charged with an ten spoked water wheel sable and rear a birch tree Or with a stem Argent.“ The arms were never granted. One reason may be the offence against heraldic rules, especially against tinctures rules, beyond that there are too many symbols on the arms.

The pale wavy and the water wheel symbolize the Orpe river und and the water mill at the "Udorfer Eisenhammer". The birch tree is a typical tree in the area, its stands further for the nice nature. The star is the star of the Principality of Waldeck, to which some parts of the village belonged in former times.
This image is taken from www.ngw.nl – Heraldry of the World –  an international civic heraldry site by Ralf Hartemink. ngw.nl/heraldrywiki/index.php?title=Udorf

Udorf - Stadt Marsberg
Website Udorf
Unknown authorUnknown author - constructed and added by Jürgen Krause