Onderdendam is a village in Het Hogeland municipality in the province of Groningen, the Netherlands. It had a population of around 575 in 2021.^[1]

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Onderdendam
Village
Corn mill Hunsingo
Onderdendam Location in the province of Groningen in the Netherlands Show map of Groningen (province) Onderdendam Onderdendam (Netherlands) Show map of Netherlands
Coordinates: 53°20′N 6°35′E
Country	Netherlands
Province	Groningen
Municipality	Het Hogeland
Area [1]
• Total	6.00 km2 (2.32 sq mi)
Elevation [2]	0.2 m (0.7 ft)
Population  (2021)[1]
• Total	575
• Density	96/km2 (250/sq mi)
Postal code	9959[1]
Dialing code	050

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The village is first mentioned in 1252 as "et ulderna domme". Even though it seemingly translates to "below the dam", the etymology is unclear.^[3] Onderdendam developed in the 16th and 17th century at the intersection of land- and waterways. In 1653, the Boterdiep was built which further enhanced its position, and it became a village of warehouses and traders.^[4]

The Dutch Reformed church is a small domed church built in 1840 as a replacement of the church of Onderwierum [nl].^[4] The court house was built in 1804 as a wide white plastered building on the main street. Later it became an inn.

In 1811, Onderdendam became the capital of the municipality Bedum.^[4] Onderdendam was home to 498 people in 1840.^[5] Around 1900, Bedum started to outgrow Onderdendam.^[4]

Onderdendam was part of the municipality of Bedum until 2019 when it became part of the municipality of Het Hogeland.^[5]

• Dutch Reformed church
• Canal view
• Street view
• Draw bridge and het Jagertje statue