In recent years, the world’s urban population has exceeded the rural population for the first time. Yet to read some reports, one could get the impression that the typical urban resident lives in one of the largest cities, like Manila, Shanghai, London, or Seoul. In fact, the megacities have only 8.4 percent of the world’s population. Nearly twice that number live in urban areas with fewer than 100,000 residents (Figure 2). In the US, any settlement with a population of 2,500 is considered an urban area.