The municipality consists of 15 centres named Bannerod, Bermuthshain, Crainfeld, Grebenhain (administrative seat), Hartmannshain, Heisters, Herchenhain, Ilbeshausen-Hochwaldhausen, Metzlos, Metzlos-Gehaag, Nösberts-Weidmoos, Vaitshain, Volkartshain, Wünschen-Moos und Zahmen.

The area nowadays occupied by the greater community of Grebenhain in the Vogelsberg was likely settled by waves of settlers from the Wetterau between the eighth and eleventh centuries as part of the expansion carried out in the High Middle Ages by the Abbots of Fulda.

Crainfeld advantageously lay at the crossroads of two important mediaeval trade roads, and was moreover until 1821 the seat of a court district, witnessed even today by the Edelhof, the Amt building used by the Oberschultheißen (roughly "sheriffs") when the Landgraves held sway in Hesse.

Until the State Highway (Staatsstraße), today's Bundesstraße 275, was built in 1834-1857, and the railway line in 1901-1906 through the neighbouring community of Grebenhain, Crainfeld was the region's main town.

The communities of Bannerod, Heisters, Zahmen, Wünschenmoos, Vaitshain, Nösberts, Weidmoos, Metzlos-Gehaag and Metzlos belonged until 1806 to the court districts of Altenschlirf and Moos, held by the Riedesel family.