Saint-Martin-de-Seignanx (French pronunciation: [sɛ̃ maʁtɛ̃ də sɛɲɑ̃]; Gascon: Sent Martin de Senhans) is a commune in the Landes department in Nouvelle-Aquitaine in southwestern France.

Historical population

Year Pop. ±% p.a. 1793 2,151 —     1800 1,838 −2.22% 1806 1,976 +1.21% 1821 2,092 +0.38% 1831 2,280 +0.86% 1836 2,411 +1.12% 1841 2,515 +0.85% 1846 2,489 −0.21% 1851 2,592 +0.81% 1856 2,497 −0.74% 1861 2,627 +1.02% 1866 2,697 +0.53% 1872 2,703 +0.04% 1876 2,740 +0.34% 1881 2,713 −0.20% 1886 2,605 −0.81% 1891 2,524 −0.63% 1896 2,548 +0.19%	Year Pop. ±% p.a. 1901 2,614 +0.51% 1906 2,634 +0.15% 1911 2,509 −0.97% 1921 2,275 −0.97% 1926 2,272 −0.03% 1931 2,281 +0.08% 1936 2,109 −1.56% 1946 2,019 −0.44% 1954 2,044 +0.15% 1962 2,003 −0.25% 1968 2,053 +0.41% 1975 2,318 +1.75% 1982 2,903 +3.27% 1990 3,047 +0.61% 1999 3,903 +2.79% 2007 4,715 +2.39% 2012 4,929 +0.89% 2017 5,488 +2.17%
Source: EHESS and INSEE (1968-2017)

Saint-Martin-de-Seignanx is a sister city of the Spanish town Oyón-Oion.

• Communes of the Landes department