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Ernstbrunn is situated at an altitude of 293 m in the southern part of the Leiser Berge nature reserve in the heart of the Weinviertel region of Lower Austria. Ernustisprunnin was first mentioned in a document of 1045/55. The name refers to a spring (Brunnen = well, spring) which some 400 years later, in 1432, was first mentioned as a place where people sook healing. Ernstbrunn obtained the status of a market town in 1533. Important for the economical development during the late 19th century was the opening of the railway lines to Korneuburg in 1904 and to Mistelbach in 1906. Both lines were closed in 1988.

The parish church Sankt Martin [left] was first mentioned in 1045/55. The present church was built in the first half of the 18th century in Baroque style. The chancel and the east tower still date from the Gothic period.