Sielmingen is a former municipality in the Esslingen district, in Baden-Württemberg, Germany. It was first recorded in year 1275 as Sygehelmingen. In 1975 it was merged with the municipalities Bernhausen, Bonlanden, Plattenhardt and Harthausen to form the new town Filderstadt. Sielmingen is today a quartier of that town, formally named Filderstadt-Sielmingen. It has 7,566 inhabitants. Villages in Baden-Württemberg Former municipalities in Baden-Württemberg