Althengstett was first mentioned in a document from around 1120 regarding a donation toHirsau Abbey as "Hingesteten". The village was purchased in 1301 byHerrenalb Abbey and, some time from 1338 to 1341, theCounty of Württemberg was named protector of the town. It was assigned to themonastic office [de] atMerklingen.[3]
Althengstett has three boroughs, Althengstett, Neuhengstett, and Ottenbronn, and the industrial district of Unterer Wald. Theabandoned villages of Schlehdorn and Schweichingen are also found in the municipal area.[3]
Althengstett'scoat of arms displays awhite stallion standing and facing left upongreen ground upon afield ofblue. The design of the coat of arms is a reference to the name Althengstett, created in on the advice of theCentral State Archive Stuttgart [de]. It was however not until 1952 that itstincture was decided and it was adopted by the municipal council. The coat of arms were retained after the 1974 merger and it was approved for municipal use by the Calw district office on 8 June 1982. A corresponding municipal flag was also issued on that date.[3]