Why can central cities have fewer residents than people employed there?

Central cities often have fewer residents than the number of people employed there because of the distinct separation between commercial and residential land use within metropolitan areas.

The downtown or central business district is typically the oldest section of a city, where land is most costly and use is most intensive. This area is dominated by major financial, governmental, and commercial offices that attract a large workforce daily. Conversely, residential development—particularly for single-family homes—has historically pushed outward toward the suburbs. This shift was driven by a desire for more living space, the affordability of suburban land, and the development of infrastructure like the Interstate Highway System, which allowed workers to commute into the city via automobile.12

As a result, many people who work in the central city reside in the surrounding metropolitan sprawl, leading to a daily influx of commuters. While some cities have seen a rebound in downtown living, the traditional pattern remains one where the core functions primarily as a hub for employment and commerce rather than as a high-density residential area.13