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U.S. Census Bureau regions and divisions. Since 1950, the United States Census Bureau defines four statistical regions, with nine divisions. [1] [2] The Census Bureau region definition is "widely used... for data collection and analysis", [3] and is the most commonly used classification system.
The logo of the United States Geological Survey (USGS) The Geographic Names Information System (GNIS) is a database of name and location information about more than two million physical and cultural features throughout the United States and its territories; as well as the associated states of the Marshall Islands, Federated States of Micronesia, and Palau; and Antarctica.
The classification system has four levels, but only Levels I and III are on this list. Level I divides North America into 15 broad ecoregions; of these, 12 lie partly or wholly within the United States. Fifty Level II regions were created to allow for a narrower delineation of
ISO 3166-2:US is the entry for the United States in ISO 3166-2, part of the ISO 3166 standard published by the International Organization for Standardization (ISO), which defines codes for the names of the principal subdivisions (e.g., provinces or states) of all countries coded in ISO 3166-1.
The Census Bureau region definition (Northeast, Midwest, South, and West) is "widely used ... for data collection and analysis," [84] and is the most commonly used classification system. [ 85 ] [ 86 ] [ 87 ] Other multi-state regions are unofficial, and defined by geography or cultural affinity rather than by state lines.
The megaregions of the United States are eleven regions of the United States that contain two or more roughly adjacent urban metropolitan areas that, through commonality of systems, including transportation, economies, resources, and ecologies, experience blurred boundaries between the urban centers, perceive and act as if they are a continuous urban area.
So when a concrete definition is needed one should use the Census Bureau model defined by the United States Government, which has grouped states into regions for decades. Most government agencies, including the FBI, use the Census Bureau Model. The Census Bureau regions are largely ignored by most encyclopedias, a notable exception being ...
[21] [22] As defined by the United States Census Bureau, [1] the Southern region of the United States includes sixteen states and the District of Columbia. As of 2010, an estimated 114,555,744 people, or thirty-seven percent of all U.S. residents, lived in the South, the nation's most populous region. [ 23 ]