Denzlingen is located in the Upper Rhine Valley (Oberrheinische Tiefebene) at the edge of the Black Forest (Schwarzwald) between the river Elz in the north and the Glotter which runs through the southern part of the town.

The two settlements eventually grew together into one stretched-out town, which led to the sobriquet of Langendenzlingen, meaning "Long Denzlingen".

The Thirty Years' War veteran Hans Jakob Christoffel von Grimmelshausen described the battle between Imperial and Swedish troops at Denzlingen in the novel Simplicius Simplicissimus.

Other religious denominations (mostly members of the New Apostolic Church and Baptists) account for about 1% of the population, while 23% remain nondenominational.

After the death of mayor Lothar Fischer in April 2009, Markus Hollemann (ÖDP) was elected as his successor on 19 June 2009.