Jalasjärvi is a former municipality of Finland. It was merged to the town of Kurikka on 1 January 2016.

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Jalasjärvi
Former municipality
Jalasjärven kunta Jalasjärvi kommun
Coat of arms
Location of Jalasjärvi in Finland
Coordinates: 62°29.5′N 022°46′E
Country	Finland
Region	Southern Ostrobothnia
Sub-region	Seinäjoki sub-region
Charter	1867
Consolidated	2016
Government
• Municipal manager	Juha Luukko
Area [1]
• Total	830.39 km2 (320.62 sq mi)
• Land	818.70 km2 (316.10 sq mi)
• Water	11.69 km2 (4.51 sq mi)
Population  (2015-06-30)[2]
• Total	7,834
• Density	9.4/km2 (24/sq mi)
Time zone	UTC+2 (EET)
• Summer (DST)	UTC+3 (EEST)
Website	www.jalasjarvi.fi

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It is located in the province of Western Finland and is part of the Southern Ostrobothnia region. The population of Jalasjärvi was 7,834 (30 June 2015)^[2] and covered a land area of 818.70 km² (316.10 sq mi).^[1] The population density was 9.5688/km² (24.7832/sq mi).

The municipality was unilingually Finnish.

Alavalli, Hirvijärvi, Ilvesjoki, Jalasjärvi, Jokipii, Keskikylä, Koskue, Luopajärvi, Sikakylä, Taivalmaa and Ylivalli.

• The Devil's Nest, the deepest ground erosion in Europe
• The Local Heritage Museum of Jalasjärvi, one of the largest local museums in Finland, consisting of over 25 rural buildings and a collection of exhibits approaching nearly 30,000 items in total