The municipality lies in the middle of the Hunsrück between Simmern and Kastellaun, right on the Schinderhannes-Radweg (cycle path) at a mean elevation of 320 m above sea level.

The villages of Nannhausen, Fronhofen, Biebern, Reich, Wüschheim, Eichkülz and Keidelheim together formed a Schultheißerei.

The nobility lost their holdings, churches and monasteries were expropriated and estates could be acquired by those who had hitherto been their tenants.

With Napoleon's defeat in Russia began a time in which Austrians, Russians, Bavarians and Prussians quartered themselves locally and imposed more compulsory labour on the people.

The municipality of Keidelheim passed to the Bürgermeisterei (“Mayoralty”) of Simmern, and is still part of that – in its newer incarnation as a Verbandsgemeinde – even now.

Despite progressive Prussian measures in agriculture and road building, bad harvests and a sharp rise in population led to gradual impoverishment.

The Third Reich brought along with it ideological change and also altered municipal politics, with Keidelheim being no different in this respect to any other place in Germany.

The harsh winter of 1946-1947 and the summertime drought that followed once again brought the French zone of occupation dangerously close to famine.

With currency reform and an unexpectedly good harvest in 1948, as well as help from the Marshall Plan, things began to turn round.

The following are listed buildings or sites in Rhineland-Palatinate’s Directory of Cultural Monuments:[4] Keidelheim is home to three notable oak trees.

Keidelheim also has a notable beech tree standing on a slope before the former level crossing on the road to Simmern.

[5] Cyclists, hikers and skaters have the Schinderhannes-Radweg (cycle path) at their disposal running along the old Hunsrückbahn (railway) right-of-way.