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Östhammar is a locality and the seat of Östhammar Municipality, Uppsala County, near the östhammarsfjorden, about 105 km northeast of Stockholm and about 61 northeast of the county capital, Uppsala. Östhammar has a population of about 4,700 (2015), the municipality has a population of about 22,400 (2021).

Östhammar was first mentioned in a document in 1368, when it was granted city status. During this period a castle called Östhammarshus was built, but already in 1434 the castle was burnt down by its Danish bailiff, who fled to Denmark when faced with the Engelbrekt rebellion. By the late 15th century the post-glacial rebound had made it hard to reach Östhammar by boat and its city status was transferred to Öregrund. Östhammar regained its city status in 1538, and moved closer to the sea. In 1651, Östhammar got a town hall, and in 1795 Östhammar was heavily damaged by fire. Between the early 17th century and the middle of the 19th century the fishing of herring played a very important role in Östhammar's economy.

[https://de.wikipedia.org/wiki/%C3%96sthammar, https://en.wikipedia.org/wiki/%C3%96sthammar]