Oberahr lay in the former Niederlahngau from its earliest times, in the parish and court district of Meudt under the overlordship of the Counts at Diez and Nassau.

Under the 1564 Treaties of Diez, the parish of Meudt passed to the Electorate of Trier, and thereby the Oberahrers lived in the Trierschland until 1802 under the rule of the Krummstab (literally “Crooked Staff”, but meaning “crosier”).

The mountains and the Beulstein are heraldically represented in the arms as a blue and gold three-knolled hill (Dreiberg in German heraldry).

The agriculture and the forest are each symbolized by a sprouting golden ear and a beech leaf Running right through the community is Bundesstraße 255, linking Montabaur and Rennerod.

The nearest InterCityExpress stop is the railway station at Montabaur on the Cologne-Frankfurt high-speed rail line.