Unterreichenbach is in the Nagold River Valley between Calw and Pforzheim, at an altitude of between 292 und 633 metres.

The first preserved mention of Kapfenhardt, today part of Unterreichenbach, dates to 1260, and it had passed to Württemberg in the early 14th century.

[4] Beginning in the 14th century, the area was an increasingly popular spa, but this ended with a mid-19th-century avalanche which shut off the Gutenbrunnen hot spring.

However, the area continued to attract tourists, and the mill inns had developed into internationally famous hotels by the Second World War.

Unterreichenbach is served by the Nagold Valley Railway, which runs from Pforzheim to Horb am Neckar.