According to SCB's population forecast, Södermanland County is expected to continue growing, but the differences between municipalities are large. The county is projected to increase by just over 12,500 inhabitants compared to 2024, with Eskilstuna growing weakly, while in Flen and Vingåker the development goes in the opposite direction. The exact projected population numbers for each municipality in Södermanland County have not been detailed in the forecast.
Trosa stands out as the municipality in the country projected to grow the most percentage-wise by 2040, with 20 percent, though what specific factors are driving this growth remains unclear. Kungälv is in second place with 17 percent growth, followed by Uppsala with 15 percent, while Strängnäs also gets a significant boost according to the forecast. SCB's forecasts are based on estimates of future births, mortality, and immigration/emigration to give an indication of how Sweden's population may change in the future.
According to the forecast, Sweden's population is expected to increase by 420,000 people by 2040. How the forecasts account for potential economic or policy changes that could affect migration patterns is not specified, and the reliability of these long-term projections given uncertainties in birth rates and migration trends is an open question.