Assieu is located some 30 km south by south-east of Givors and 8 km east by north-east of Saint-Maurice-l'Exil. Access to the commune is by the D131 road from the D134 in the south passing north then east in the commune to the town then north and continuing north-west to Route nationale 7. Apart from the town there is the village of La Charinaz in the east and Les Bruyeres in the west. The commune has large forests in the east as well as one in the west with significant residential areas and the rest of the land farmland.

The Vareze river forms the northern border and gathers many tributaries rising in the commune as it flows west to join the Rhône at Saint-Alban-du-Rhône.

Blazon: Azure, a fox rampant of Or, in chief the same charged with three dolphins of Azure, crested, finned, and eyebrowed in Gules.

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List of Successive Mayors

The inhabitants of the commune are known as Assieutois or Assieutoises in French.

Historical population

Year Pop. ±% p.a. 1793 621 —     1800 686 +1.43% 1806 562 −3.27% 1821 423 −1.88% 1831 556 +2.77% 1836 725 +5.45% 1841 707 −0.50% 1846 731 +0.67% 1851 736 +0.14% 1856 713 −0.63% 1861 637 −2.23% 1866 659 +0.68% 1872 700 +1.01% 1876 693 −0.25% 1881 669 −0.70% 1886 655 −0.42% 1891 620 −1.09% 1896 587 −1.09%	Year Pop. ±% p.a. 1901 559 −0.97% 1906 527 −1.17% 1911 537 +0.38% 1921 522 −0.28% 1926 507 −0.58% 1931 503 −0.16% 1936 505 +0.08% 1946 455 −1.04% 1954 552 +2.45% 1962 521 −0.72% 1968 514 −0.23% 1975 567 +1.41% 1982 612 +1.10% 1990 768 +2.88% 1999 889 +1.64% 2007 1,257 +4.42% 2012 1,368 +1.71% 2017 1,472 +1.48%
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Source: EHESS and INSEE

• Chateau Juveneton
• Chateau Richoux
• Church from the 19th century

• Communes of the Isère department

• Assieu on the old IGN website (in French)
• Assieu on Géoportail, National Geographic Institute (IGN) website (in French)
• Aßien on the 1750 Cassini Map

Wikimedia Commons has media related to Assieu.