Rohrdorf was first mentioned in 788 in the so called notitia arnonis.
Settlements have been proofed also in prehistoric time.
See also:
http://www.rohrdorf.de
... 8.3% have a female householder with no husband present, and 13.1% are non-families. 11.0% of all households are made up of individuals and 6.9% have someone living alone ...