The greater part of the Selters municipal area with the centres of Niederselters, Eisenbach, Münster and Haintchen lies in the area of the Eastern Hintertaunus north of the Taunus' main ridge, at elevations from 170 to 500 m. In terms of natural environments, the main centre, Niederselters, also belongs to the southeastern part of the Limburg Basin.

Selters has four Ortsteile, given here with their population figures: A productive mineral spring is located in the centre of Niederselters,[3] giving Selterswasser its name.

The state of Hesse, as Prussia’s legal successor, sold the spring in 1970, whereafter it changed owners ever more quickly, and in 1999 the bottling at the fountain in Niederselters was shut down.

The municipal election held on 26 March 2006 yielded the following results: Selters is linked to the long-distance road network by the Bad Camberg interchange on the A 3 (Cologne–Frankfurt) some 5 km away to the south.

The centre of the German branch of the Jehovah's Witnesses is found under the name Wachtturm Bibel- und Traktatgesellschaft der Zeugen Jehovas e.V.