The municipality (Gemeinde) of Allmersbach lies at the center of the Rems-Murr district of Baden-Württemberg, one of the 16 States of the Federal Republic of Germany. Allmersbach is physically located in the Neckar basin and the southwest edge of the Backnanger Bucht. The municipal area also includes portions of the Schurwald and Welzheim Forest. Elevation above sea level in the municipal area ranges from a high of Normalnull (NN) to a low of NN.