In 1806, the commune of Saint-Leu-la-Forêt merged with the neighboring commune of Taverny, resulting in the creation of the commune of Saint-Leu-Taverny.
In 1821, the commune of Saint-Leu-Taverny was demerged. Thus, Saint-Leu-la-Forêt and Taverny were both restored as separate communes.
Population
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Louis Henri Joseph de Bourbon (1756-1830), the last Prince of Condé, was found dead, probably by suicide, at the Château de Saint-Leu on 27 August 1830.