Eckerö is a municipality of Åland, an autonomous territory under Finnish sovereignty. The municipality has a population of 941 (31 December 2023)^[2] and covers an area of 752.67 square kilometres (290.61 sq mi) of which 644.94 km² (249.01 sq mi) is water.^[1] The population density is 8.74 inhabitants per square kilometre (22.6/sq mi).

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Eckerö
Municipality
Eckerö kommun
Eckerö
Coat of arms
Location of Eckerö in Finland
Eckerö Location in Åland
Coordinates: 60°13′N 019°33′E
Country	Finland
Region	Åland
Sub-region	Åland Countryside sub-region
Government
Area  (2018-01-01)[1]
• Total	752.67 km2 (290.61 sq mi)
• Land	107.72 km2 (41.59 sq mi)
• Water	644.94 km2 (249.01 sq mi)
• Rank	297th largest in Finland
Population  (2023-12-31)[2]
• Total	941
• Rank	298th largest in Finland
• Density	8.74/km2 (22.6/sq mi)
Population by native language [3]
• Swedish	87.5% (official)
• Finnish	4.9%
• Others	7.6%
Population by age [4]
• 0 to 14	14%
• 15 to 64	59.6%
• 65 or older	26.4%
Time zone	UTC+02:00 (EET)
• Summer (DST)	UTC+03:00 (EEST)
Website	www.eckero.ax

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The municipality is unilingually Swedish and 87.5% of the population are Swedish speakers. It is the westernmost municipality of Åland and Finland. The company Eckerö Linjen operates a ferry connection between Berghamn in Storby, Eckerö and Grisslehamn on Väddö, Norrtälje in Sweden.

The municipality has previously also been known as Ekkerö in Finnish documents,^[5] but is today referred to as "Eckerö" also in Finnish.

Eckerö's most famous building is the Post and Customs house. It is the largest building that has been erected to aid the postal services between Stockholm and St. Petersburg. The building was built during the Russian era in 1828. Architect C.L Engel made the construction plans.^[6]