Phoenix City, located in the state of Arizona, United States, is situated entirely within a single county, known as Maricopa County. This unique characteristic sets Phoenix apart from many other major cities in the United States, which are typically spread across multiple counties. The city's location within Maricopa County is a result of its rapid growth and expansion during the late 19th and early 20th centuries, which led to the consolidation of various smaller towns and communities into the larger city of Phoenix.

The concentration of Phoenix City within Maricopa County is significant for several reasons. Firstly, it allows for more efficient governance and resource allocation. With a single county overseeing the city, there is a streamlined process for local government operations, including public services, infrastructure development, and public safety. This centralized approach can lead to more effective management and coordination of city services.

Secondly, the single-county status of Phoenix City has implications for demographic and economic data. According to the U.S. Census Bureau, Maricopa County is the most populous county in the United States, with an estimated population of over 4.9 million residents as of 2020. This high population density contributes to the economic vitality of Phoenix, making it a major hub for business, technology, and tourism.

Furthermore, the single-county structure of Phoenix City has influenced its development patterns. The city has experienced significant urban sprawl, with a large portion of its land area dedicated to residential and commercial development. This has led to the creation of numerous suburban communities within the city limits, further contributing to its growth and population.

In conclusion, Phoenix City is located entirely within Maricopa County, a unique characteristic that has implications for governance, demographics, and economic development. The single-county status allows for efficient local government operations and contributes to the city's status as a major economic and cultural center in the United States.