Saint-Ouen-la-Rouërie (French pronunciation: [sɛ̃.t‿wɛ̃ la ʁwɛʁi]; Breton: Sant-Owen-Reoger) is a former commune in the Ille-et-Vilaine department in Brittany in northwestern France. On 1 January 2019, it was merged into the new commune Val-Couesnon.

The commune lies 47 km (29 mi) northeast of Rennes and 21 km (13 mi) south of Mont Saint-Michel on the border with Normandy.

Saint-Ouen's adjoining communes are Sacey and Montanel in Manche, and Coglès, Tremblay, and Antrain, in Ille-et-Vilaine.

Inhabitants of Saint-Ouen-la-Rouërie are called audoniens in French.

Historical population

Year Pop. ±% 1793 1,972 —     1800 1,743 −11.6% 1806 1,663 −4.6% 1821 1,500 −9.8% 1831 2,076 +38.4% 1836 2,106 +1.4% 1841 2,053 −2.5% 1846 2,105 +2.5% 1851 2,152 +2.2% 1856 2,082 −3.3% 1861 2,102 +1.0% 1866 2,020 −3.9% 1872 1,973 −2.3% 1876 1,933 −2.0% 1881 1,903 −1.6% 1886 1,828 −3.9% 1891 1,837 +0.5%

Year Pop. ±% 1896 1,670 −9.1% 1901 1,630 −2.4% 1906 1,634 +0.2% 1911 1,579 −3.4% 1921 1,310 −17.0% 1926 1,306 −0.3% 1931 1,397 +7.0% 1936 1,350 −3.4% 1946 1,276 −5.5% 1954 1,247 −2.3% 1962 1,186 −4.9% 1968 1,046 −11.8% 1975 950 −9.2% 1982 836 −12.0% 1990 783 −6.3% 1999 751 −4.1% 2009 790 +5.2%

• The 18th-century Château de la Rouërie

• Communes of the Ille-et-Vilaine department

• Base Mérimée: Search for heritage in the commune, Ministère français de la Culture. (in French)