Jevnaker is a municipality in Oppland county, Norway. The administrative centre of the municipality is the village of Jevnaker with a population of 4,302.

The parish of Jævnaker was established as a municipality on 1 January 1838 (see formannskapsdistrikt). The area of Lunner was separated from the municipality of Jevnaker on 1 January 1898 to form a municipality of its own.

The municipality is (together with Gran and Lunner) a part of the Hadeland traditional region. The Hadeland region has a population of about 30,000. The region spreads over a large area including several villages and towns.

The municipality (originally the parish) is named after the old Jevnaker farm (Old Norse: Jafnakr), since the first church was built here. The first element is jafn which means "even" or "flat" and the last element is akr which means "field" or "acre". Prior to 1889, the name was written "Jævnaker".

The coat-of-arms is from modern times. They were granted on 24 June 1983. The arms show three silver-colored glasses, since glassblowing has been a long tradition and industry in the municipality (see Hadeland Glassverk). The red colour of the background was also chosen as the colour of the glass when hot.

(See also coat-of-arms of Gildeskål)

Jevnaker is situated at the southern end of the Randsfjorden. The municipality is bordered to the north by the municipality of Gran, to the east by Lunner, and to the southwest by Ringerike (in Buskerud county).

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