Ailertchen lies 6 km northwest of Westerburg on a broad plain. Within the community rises the river Elbbach, part of the river Lahn’s drainage basin. At the community's southern edge lies the Ailertchen airport.
History
In 930, Ailertchen had its first documentary mention.
Politics
The municipal council is made up of 13 council members, including the extraofficial mayor (Bürgermeister), who were elected in a majority vote in a municipal election on 13 June 2004.