The coat of arms is based on the coat of arms of the
counts of the Mark, showing a chequered red-white bar on a yellow shield. The oldest version of the coat of arms is known from a wood carving in the city church dated from the 16th century; it showed
Saint Mary on top of the coat of arms of the Mark. Later the Mary picture was moved inside the shield. It was officially granted on November 25, 1912. After the communal reform of 1975 the city changed their coat of arms. In the bottom of the shield the black cross of the bishops of Cologne was added, representing the municipalities of the former
Amt Balve which historically belonged to Kurköln. The new coat of arms was granted on March 23, 1979, based on a design by Professor Hußmann. The
Amt Neuenrade also had a coat of arms. It was granted on January 13, 1938, and was designed by Waldemar Mallek based on an idea of Dr.
Fritz Thomée. It resembled the coat of arms of the city Neuenrade, the bottom part showed a mill wheel. As a municipality Dahle had no traditional heraldic symbol. The mill wheel was chosen symbolizing the traditional industries at the Nette River. ==Population development==