Sinzig received its first official recognition in 762 A.D. On 10 July that year, King Pippin the Younger, the father of Charlemagne, presented a certificate of his decree in the Palace of Sinzig (Sentiaco Palacio), officially recognizing the town as "Sentiacum."

Little of the wall now remains, as industrialization and urban development led to its nearly complete loss at the end of the 19th century.

After World War II, Sinzig experienced a population explosion and soon evolved into an industrial town.

There is no point in the "Golden Mile" where the defining icon of Sinzig, the parish church of Saint Peter, cannot be seen.

Between 1854 and 1858, a businessman, Gustav Bunge of Cologne, ordered the erection of a summer villa in Sinzig in the style of a neo-Gothic palace.