Saint-Ouen-sur-Maire (French pronunciation: [sɛ̃.t‿wɛ̃ syʁ mɛʁ] ) is a former commune in the Orne department in north-western France. On 1 January 2016, it was merged into the new commune of Écouché-les-Vallées.

The inhabitants are known as Audoniens and Audoniennes.

The population has varied over the past 200 years:

Historical population

Year Pop. ±% p.a. 1793 248 —     1800 233 −0.89% 1806 245 +0.84% 1821 244 −0.03% 1836 272 +0.73% 1841 301 +2.05% 1846 305 +0.26% 1851 307 +0.13% 1856 306 −0.07% 1861 307 +0.07% 1866 252 −3.87% 1872 191 −4.51% 1876 187 −0.53% 1881 154 −3.81% 1886 152 −0.26% 1891 130 −3.08% 1896 113 −2.76%	Year Pop. ±% p.a. 1901 90 −4.45% 1906 97 +1.51% 1911 105 +1.60% 1921 83 −2.32% 1926 85 +0.48% 1931 75 −2.47% 1936 78 +0.79% 1946 80 +0.25% 1954 92 +1.76% 1962 79 −1.89% 1968 93 +2.76% 1975 91 −0.31% 1982 130 +5.23% 1990 129 −0.10% 1999 112 −1.56% 2006 107 −0.65% 2019 92 −1.16%
Source: EHESS (1793-2006) and INSEE (2019)

• Communes of the Orne department