City populations refer to the number of people living in a specific urban area. These populations can vary widely, with some cities like Tokyo having over 37 million residents, while smaller cities may have just a few thousand. Population size can influence city services, infrastructure, and economic opportunities. Population growth in cities often results from factors such as migration, birth rates, and economic development. Many people move to cities in search of better job prospects and living conditions. Understanding city populations helps governments plan for housing, transportation, and public services to meet the needs of their residents.