It is located in the European Metropolis of Lille, and is a suburb of the city of Lille, bordering it on its southwest side. In 2018, Loos had a population of 22,426. The commune has a land area of 6.95 km (2.68 sq mi).

The town hall of Loos, with its large belfry, was inscribed on the UNESCO World Heritage List in 2005 in recognition of its historical importance to municipal power in Europe.

Historical population

Year Pop. ±% p.a. 1793 1,040 —     1800 1,007 −0.46% 1806 1,061 +0.87% 1821 1,160 +0.60% 1831 1,564 +3.03% 1836 1,891 +3.87% 1841 3,404 +12.48% 1846 4,117 +3.88% 1851 4,082 −0.17% 1856 5,169 +4.84% 1861 5,172 +0.01% 1866 5,702 +1.97% 1872 6,333 +1.76% 1876 6,706 +1.44% 1881 6,617 −0.27% 1886 7,753 +3.22% 1891 7,924 +0.44% 1896 8,770 +2.05%	Year Pop. ±% p.a. 1901 9,513 +1.64% 1906 10,640 +2.26% 1911 11,468 +1.51% 1921 12,197 +0.62% 1926 13,865 +2.60% 1931 14,233 +0.53% 1936 14,362 +0.18% 1946 14,678 +0.22% 1954 14,882 +0.17% 1962 18,367 +2.66% 1968 21,007 +2.26% 1975 21,530 +0.35% 1982 20,640 −0.60% 1990 20,657 +0.01% 1999 20,869 +0.11% 2007 21,043 +0.10% 2012 21,176 +0.13% 2017 22,233 +0.98%
Graphs are unavailable due to technical issues. Updates on reimplementing the Graph extension, which will be known as the Chart extension, can be found on Phabricator and on MediaWiki.org.
Source: EHESS and INSEE (1968–2017)

The arms of Loos are blazoned : Gules, 3 crescents Or.

Loos is twinned with Geseke, Germany.

• Communes of the Nord department

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• Official website (in French)

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