Unna (district)

The Unna () district is a Kreis (district) in central North Rhine-Westphalia, Germany.
History.
The area was known as Hamm for a long time. In 1901 the town of Hamm itself became a separate urban district, but government of Hamm Rural District stayed in the city until 1929. In that year the administration was moved to Unna, when the district name also changed to Unna.
By 1975, the towns of Lünen, Schwerte, Selm and Werne had joined the district.