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Tergnier
Commune
Town hall
Coat of arms
Location of Tergnier
Tergnier Show map of France Tergnier Show map of Hauts-de-France
Coordinates: 49°39′23″N 3°17′18″E / 49.6564°N 3.2883°E / 49.6564; 3.2883
Country	France
Region	Hauts-de-France
Department	Aisne
Arrondissement	Laon
Canton	Tergnier
Intercommunality	CA Chauny Tergnier La Fère
Government
• Mayor (2020–2026)	Michel Carreau[1] (PCF)
Area 1	17.98 km2 (6.94 sq mi)
Population  (2021)[2]	13,431
• Density	750/km2 (1,900/sq mi)
Time zone	UTC+01:00 (CET)
• Summer (DST)	UTC+02:00 (CEST)
INSEE/Postal code	02738 /02700
Elevation	44–90 m (144–295 ft) (avg. 53 m or 174 ft)
1 French Land Register data, which excludes lakes, ponds, glaciers > 1 km2 (0.386 sq mi or 247 acres) and river estuaries.

Tergnier (French pronunciation: [tɛʁɲe]) is a commune in the department of Aisne, Hauts-de-France, France. Its location on the Canal de Saint-Quentin and the Creil–Jeumont railway (Tergnier station) supported its development as an industrial centre in the second half of the 19th century.

The commune of Tergnier absorbed the former communes of Fargniers and Vouël in 1973, and Quessy in 1991.^[3] Since the 2020 municipal elections, Michel Carreau has been the mayor of Tergnier.

Tergnier is twinned with the municipality of Wolfhagen (Germany) since 17 May 1981.^[4]

The population data in the table and graph below refer to the commune of Tergnier proper, in its geography at the given years, i.e. excluding former communes that were absorbed at a later date.

Historical population

Year Pop. ±% p.a. 1793 222 —     1800 249 +1.65% 1806 263 +0.92% 1821 223 −1.09% 1831 269 +1.89% 1836 258 −0.83% 1841 276 +1.36% 1846 273 −0.22% 1851 304 +2.17% 1856 862 +23.18% 1861 1,235 +7.46% 1866 1,806 +7.90% 1872 2,572 +6.07% 1876 3,079 +4.60% 1881 3,536 +2.81% 1886 3,708 +0.95% 1891 3,740 +0.17% 1896 3,960 +1.15%	Year Pop. ±% p.a. 1901 4,084 +0.62% 1906 4,307 +1.07% 1911 4,898 +2.61% 1921 2,076 −8.23% 1926 3,453 +10.71% 1931 4,080 +3.39% 1936 4,357 +1.32% 1946 3,370 −2.54% 1954 5,002 +5.06% 1962 5,827 +1.93% 1968 5,949 +0.35% 1975 11,736 +10.19% 1982 12,032 +0.36% 1990 11,698 −0.35% 1999 15,069 +2.85% 2007 14,722 −0.29% 2012 14,110 −0.85% 2017 13,456 −0.94%
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[3] and INSEE (1968-2017)[5]

• Communes of the Aisne department

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