Ornacieux (French pronunciation: [ɔʁnasjø]) is a former commune in the Isère department in southeastern France. On 1 January 2019, it was merged into the new commune Ornacieux-Balbins.

Historical population

Year Pop. ±% 1793 435 —     1806 482 +10.8% 1821 495 +2.7% 1831 495 +0.0% 1841 483 −2.4% 1851 509 +5.4% 1861 501 −1.6% 1872 419 −16.4% 1881 404 −3.6% 1891 377 −6.7% 1901 352 −6.6% 1911 321 −8.8%

Year Pop. ±% 1921 285 −11.2% 1831 253 −11.2% 1946 249 −1.6% 1954 223 −10.4% 1962 221 −0.9% 1968 219 −0.9% 1975 166 −24.2% 1982 191 +15.1% 1990 191 +0.0% 1999 228 +19.4% 2006 348 +52.6% 2011 402 +15.5%

• Communes of the Isère department