A city is a significant or large settlement. Cities in the United States are organized as municipalities with local governments. A city in the United Kingdom is a borough with a bishop's seat. A city, like "village" and "town," can also refer to its residents. In fact, cities are often referred to as "their own country!" A city can be defined by many different factors. One common definition is that a city is a population center of at least 10,000 people. However, this is not always the case. A city may have a larger or smaller population. It may also include other features such as major industries, universities, cultural institutions, etc. Some examples of cities include: New York City, Chicago, Los Angeles, Houston, Philadelphia, San Francisco, Seattle, Washington, D.C. City limits usually denote the area within which a city's administrative offices are located as well as some distance outside this zone where urban development ceases and encompasses everything beyond this limit. The word "city" has various meanings for different groups of people. For those who live in or derive benefit from the activities of a city, it can be a source of pride and an incentive to work hard. But it can also be a place full of problems, with violence being one of the most common issues affecting citizens.