Located on the left bank of the Saône, between Thoissey and Montmerle-sur-Saone, Guéreins, Latin "Guierrens" meaning ford or raft is true to this definition since it is the first town to open the doors when the Dombes comes from the Beaujolais region, after crossing the Saône. Its history, reported from 1245 to be confirmed by Innocent fourth parish where she was a priory, there is nothing remarkable until 1606, when the town gets two shows by the Duke of Bourbon, and was visited by the Archbishop of Lyon, Denis Marquemont in 1614. In 1762, there were 80 households and agricultural economy was divided between wheat and vines.
In 1789, Guéreins depended on the County Built as a community of the election of Bourg-en-Bresse. On 2 April 1829, is the concession of the suspension bridge, between the right bank and left bank of the Saône, which will be open to traffic in 1832. August 16, 1849, Louis Napoleon Bonaparte stops Guéreins and donated a bell for the church then under construction. This church consecrated in 1851. The public school and Catholic school girls were born in 1887, while the year 1890 saw the birth of the poet Pierre Aguetant. In 1897, the railway route linking St Trivier de Courtes in Trévoux was inaugurated in Guéreins. The construction of metal bridge between Belleville and Guéreins began in 1904. It will be open to the public in 1908. The body of firemen is created Guéreins in 1921 and will be linked to current SDIS in 1995. Since then, the town's population increases slowly. It is a residential town but, by integrating the Community of Communes Montmerle 3 Rivers, knows how to keep its identity and develop through the intermunicipal economy industry average.
