The city is a site with a large population and covers more of the area covered by villages and small towns. A city is also called a group of societies that have traditional, legal or cultural advantages that make it different from other regions and places. Each city has its own authority and depends on the nature of the laws in force in the country where it is located. Tokyo is the world's largest city with a population of about 37,832,892, according to the latest private update. The Atlas of the World World Atlas.