From 1939 to 1945 there was the Deutschlandsender Herzberg/Elster, a huge longwave transmitter, whose mast was the second tallest construction in the world, at Herzberg/Elster. The basement of the mast is still there.
Development of population since 1875 within the current boundaries (Blue line: Population; dotted line: comparison to population development of Brandenburg state; grey background: time of Nazi rule; red background: time of Communist rule)
Recent population development (blue line) and forecasts
Population development within the current boundaries (2013)