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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.
48°40′N 9°14′E / 48.667°N 9.233°E