The community was founded as part of Hesse's municipal reforms in 1977 from the following centres (with population figures as at 31 December 2004): Total: 7409 inhabitants Allendorf had its first documentary mention in 774.

The population in outlying hamlets had high mortality, and survivors moved to the village.

After the war, ethnic Germans expelled from the territories of East Prussia, Pomerania and Silesia, resettled in Allendorf.

The municipal elections on 26 March 2006 yielded the following results: Note: FWG is a citizens' coalition.

The greater community lies in a triangle formed by the towns of Wetzlar, Weilburg and Herborn.

The Ehringshausen and Herborn Süd Autobahn interchanges on the A 45 can be reached in 10 to 20 minutes, as is also true for Federal Highway (Bundesstraße) 49.

Each constituent community has half-timbered houses, built in different styles, that are well worth seeing.

The pathway (about 2.7 km long) is used by many hikers, cyclists, inline skaters and Nordic walkers.

In Arborn is a weekend cottage neighbourhood that has an outdoor swimming pool at its disposal.

The Beilstein castle ruins were allowed to be purchased by a private individual in the 1990s and after reconstruction is it now used for a home for handicapped young people.