Plessé (French pronunciation: [plɛse] ; Breton: Plesei) is a commune in the Loire-Atlantique department in western France.

Historical population

Year Pop. ±% p.a. 1793 2,642 —     1800 2,635 −0.04% 1806 2,954 +1.92% 1821 3,048 +0.21% 1831 3,652 +1.82% 1841 3,406 −0.69% 1846 4,011 +3.32% 1851 4,435 +2.03% 1856 4,539 +0.46% 1861 4,856 +1.36% 1866 5,126 +1.09% 1872 5,405 +0.89% 1876 5,154 −1.18% 1881 5,161 +0.03% 1886 5,366 +0.78% 1891 5,529 +0.60% 1896 5,452 −0.28% 1901 5,436 −0.06% 1906 5,478 +0.15%	Year Pop. ±% p.a. 1911 5,429 −0.18% 1921 5,232 −0.37% 1926 5,053 −0.69% 1931 4,565 −2.01% 1936 4,264 −1.35% 1946 4,062 −0.48% 1954 3,881 −0.57% 1962 3,683 −0.65% 1968 3,523 −0.74% 1975 3,395 −0.53% 1982 3,436 +0.17% 1990 3,298 −0.51% 1999 3,416 +0.39% 2004 3,756 +1.92% 2006 3,938 +2.39% 2009 4,528 +4.76% 2014 5,138 +2.56% 2019 5,266 +0.49% 2020 5,265 −0.02%
Source: EHESS and INSEE (1968-2017)

• Lucien Petit-Breton (18 October 1882 – 20 December 1917), French racing cyclist, the first to win the Tour de France twice, born in Plessé.
• Clément Guillon (27 April 1932 – 9 July 2010) was the Roman Catholic bishop of Quimper, born in Plessé.
• Catherine de Parthenay (22 March 1554 – 26 October 1631), a French noblewoman and mathematician, born in Plessé.

• Communes of the Loire-Atlantique department