Tancua is a village in the department of Jura in the region of Bourgogne-Franche-Comté, France. Formerly a separate municipality, it was merged with Morbier on 1 January 2007. Its inhabitants are known as Quewans.

Tancua was, until well into the 20th century, mainly agricultural, especially for livestock breeding and dairy farming, with somewhat of a logging industry.

Historical population

Year Pop. ±% 1793 205 —     1800 219 +6.8% 1806 219 +0.0% 1821 200 −8.7% 1831 211 +5.5% 1836 222 +5.2% 1841 213 −4.1% 1846 205 −3.8% 1851 190 −7.3% 1856 194 +2.1% 1861 194 +0.0% 1866 191 −1.5% 1872 188 −1.6% 1876 177 −5.9% 1881 159 −10.2% 1886 156 −1.9% 1891 137 −12.2%

Year Pop. ±% 1896 123 −10.2% 1901 123 +0.0% 1906 178 +44.7% 1911 303 +70.2% 1921 120 −60.4% 1926 116 −3.3% 1931 93 −19.8% 1936 87 −6.5% 1946 86 −1.1% 1954 120 +39.5% 1962 102 −15.0% 1968 109 +6.9% 1975 88 −19.3% 1982 149 +69.3% 1990 158 +6.0% 1999 167 +5.7% 2004 151 −9.6%