This is a list of urban areas in the United States as defined by the United States Census Bureau, ordered according to their 2010 census populations. An urbanized area (UA) is an urban area with population of 50,000 or more; an urban cluster (UC) has population less than 50,000. An urbanized area may serve as the core of a metropolitan statistical area, while an urban cluster may be the core of a micropolitan statistical area. The list includes urban areas with a population of at least 50,000.