Paragraph: In this case the rank-size rule is valid. The calculated actual sizes are relatively close to the actual size of the cities. If you wanted to estimate the size of Sweden's five largest cities this method would work. The estimated populations are only a few thousand off of the actual size of the cities. Population: 9,880,604 Population density: 22 sq mi % Urban population: 86% % Urban population living in Slums: N/A Average % change in urban population: 1.2% % with improved urban sanitation: 100% % with improved urban water supply: 100%