Ornézan is located 16 km south of Auch and 2 km north of Seissan, along the Gers river.

Ornézan finds its origin in the Latin patronymic name Ornatius, followed by the suffix -anum, designing a property of which a man named Ornatius must have been the owner in the times of Roman Gaul. The village is later known in Latin as Ornezanus and Ornesan in Gascon, before becoming Ornézan in French.

Historical population

Year Pop. ±% p.a. 1793 299 —     1800 273 −1.29% 1806 305 +1.86% 1821 322 +0.36% 1831 364 +1.23% 1841 323 −1.19% 1846 350 +1.62% 1851 344 −0.35% 1856 345 +0.06% 1861 342 −0.17% 1866 332 −0.59% 1872 309 −1.19% 1876 322 +1.04% 1881 297 −1.60% 1886 314 +1.12% 1891 271 −2.90% 1896 255 −1.21% 1901 256 +0.08%	Year Pop. ±% p.a. 1906 240 −1.28% 1911 247 +0.58% 1921 239 −0.33% 1926 229 −0.85% 1931 239 +0.86% 1936 265 +2.09% 1946 215 −2.07% 1954 221 +0.34% 1962 222 +0.06% 1968 209 −1.00% 1975 209 +0.00% 1982 216 +0.47% 1990 225 +0.51% 1999 237 +0.58% 2007 250 +0.67% 2012 233 −1.40% 2017 229 −0.35%
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Source: EHESS and INSEE

• Communes of the Gers department

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