Existing nationwide population projections focus on highly aggregated spatial units. The most disaggregated nationwide study is provided by the German Federal Institute for Building, Urban Affairs and Spatial Research (BBSR) and forecasts population at the county level until 2040 (BBSR, 2021)....

Existing nationwide population projections focus on highly aggregated spatial units. The most disaggregated nationwide study is provided by the German Federal Institute for Building, Urban Affairs and Spatial Research (BBSR) and forecasts population at the county level until 2040 (BBSR, 2021)....

The future development of population size and structure is of importance since planning in many areas of politics and business is conducted based on expectations about the future makeup of the population. Countries with both decreasing mortality and low fertility rates, which is the case for...