Dürnau is on the edge of the Swabian Jura, about ten kilometers south of the county town Göppingen.

The highest point is in the south on the border to the municipality of Gruibingen between Köpfle and Kornberg.

The municipality borders in the north Göppingen and Heiningen, in the east Gammelshausen, in the south Gruibingen and in the west Bad Boll.

The low noble family Dürner of Dürnau was from the 13th to the 15th century probably as ministerials in the service of the Earl of Aichelberg.

The blazon of the municipal coat of arms of Dürnau is: Argent, a black hunting horn with golden fetters.

The derived flag colors black and white were awarded by the Ministry of the Interior on 18 February 1959.

With the municipality Heiningen Dürnau is connected via a dirt road, which is however not released for public transport for transit.