The municipality lies in the central Hunsrück at the end of the Biebertal (Bieberbach valley), roughly 3 km west of Simmern.

Nannhausen has one outlying centre, or Ortsteil, named Nickweiler, and also belonging to the municipality are the Kauerhof (farm) and the Kauermühle (mill) west of the village, and the Schmiedel to the east.

Once the Dukes of Palatinate-Simmern had died out in 1673, the village passed to Electoral Palatinate, and in 1686, it was no longer forbidden to practise the Catholic faith.

A picture of life in the village from the time of French rule beginning with his grandfather's recollections and ending with his own was descriptively written by Nannhausen's onetime reeve (Ortsvorsteher), Heinrich Weinrich.

At the 300th anniversary of the introduction of the Reformation in the Duchy of Palatinate-Simmern by Frederick III, Elector Palatine, the confirmands’ institute was opened in 1857 in collaboration with the Gustav-Adolf-Werk, an Evangelical social aid organization.

[4] The following are listed buildings or sites in Rhineland-Palatinate’s Directory of Cultural Monuments:[5] On the broad lands, formerly worked as farms, of the Schmiedelanstalten, the first part of the Schmiedelpark was opened on 17 May 2002 as an adventure park with playgrounds for preschoolers and school-age children, an animal pen housing a petting zoo, a biotope, a “sense path”, a riding facility, a mountain biking lot, a barbecue pavilion and a supply pavilion.

On the property are also found a short-term care facility, which is an outpost of the Evangelical Dr. Theodor-Fricke Alten- und Pflegeheim (nursing and seniors’ home) in Simmern, and the social-paediatric centre of the deaconry of Kreuznach.

): Ein Bauer im Hunsrück, Erinnerungen und Gedanken des Hunsrücker Bauern Heinrich Weirich [aus Nannhausen], Pandion Verlag, Simmern 2000 (³2009), ISBN 978-3-922929-88-8