List of regions in the United States

This is a list of some of the regions in the United States.

Many regions in the United States are defined in law or regulations by the federal government.

The United States Census Bureau defines four statistical regions, with nine divisions. The Census Bureau region definition is "widely used … for data collection and analysis," and is the most commonly used classification system.

Regional divisions used by the United States Census Bureau:

Puerto Rico and other US territories are not part of any census region or census division.

The ten standard federal regions were established by OMB (Office of Management and Budget) Circular A-105, "Standard Federal Regions," in April, 1974, and required for all executive agencies. In recent years, some agencies have tailored their field structures to meet program needs and facilitate interaction with local, state and regional counterparts. However, the OMB must still approve any departures.

The Federal Reserve Act of 1913 divided the country into twelve districts with a central Federal Reserve Bank in each district. These twelve Federal Reserve Banks together form a major part of the Federal Reserve System, the central banking system of the United States.

The Federal Circuit is not a regional circuit. Its jurisdiction is nationwide, but based on subject matter.

The Bureau of Economic Analysis defines regions for comparison of economic data.

The Energy Information Administration currently uses the PADD system established by Petroleum Administration for War in World War II. It is used for data collection on refining petroleum and its products. Each PADD is subdivided into refining districts.

PADD I can also be subdivided into 3 Subdistricts:

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