Regions of the United States I II III IV V

Regions Defined

The regions of the United States are geographic areas which include multiple states. The regional groupings presented here and their definitions are from standard language used by libraries and reflect the groupings used in the classification system for maps. The visual grouping of regions into five maps assists users in comparing and contrasting the contents of each region. The Regions are included in the bibliographic records and are also available for access through the "Subject Index".

Region Definition Map of the Region
Atlantic States All states Maine to Florida that are near to or border on Atlantic Ocean Regional Map III.
East All states east of the Mississippi River Regional Map I.
Middle Atlantic States Delaware, District of Columbia, Maryland, New Jersey, New York, Pennsylvania Regional Map V.
Middle West Rocky Mountains to Allegheny Mountains, North of Ohio River and southern border of Missouri and Kansas: Illinois, Iowa, Indiana, Kansas, Michigan, Minnesota, Missouri, Nebraska, North Dakota, Ohio, South Dakota, Wisconsin Regional Map III.
New England Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, Vermont Regional Map V.
Northeastern States East of Mississippi River, North of Ohio and Potomac Rivers: Connecticut, Delaware, District of Columbia, Illinois, Indiana, Maine, Maryland, Massachusetts, Michigan, New Hampshire, New Jersey, New York, Ohio, Pennsylvania, Rhode Island, Vermont, Wisconsin Regional Map II.
Northwestern States Northern part of US between western edge of Lake Superior and Pacific Ocean: Idaho, Iowa, Kansas, Minnesota, Missouri, Montana, Nebraska, North Dakota, Oregon, South Dakota, Washington, Wyoming Regional Map II.
Northwest, Pacific Old Oregon country: Idaho, Oregon, Montana, Washington, Wyoming Regional Map IV.
Pacific States Alaska, California, Hawaii, Oregon, Washington Regional Map V.
Rocky Mountain Region Arizona, Colorado, Idaho, Montana, Nevada, New Mexico, Utah, Wyoming Regional Map V.
South Atlantic States Florida, Georgia, North Carolina, South Carolina, Virginia Regional Map V.
Southern States South of Mason-Dixon Line and Ohio River, from western Texas border to the Atlantic Ocean: Alabama, Arkansas, Florida, Georgia, Kentucky, Louisiana, Mississippi, North Carolina, Oklahoma, South Carolina, Tennessee, Texas, Virginia, West Virginia Regional Map IV.
Southwest, New Corresponds to old Spanish province of New Mexico including Arizona, California, Colorado, Nevada, New Mexico, and Utah Regional Map IV.
Southwest, Old Southwestern US before cessions of land from Mexico following Mexican War: Arkansas, Kentucky, Louisiana, Missouri, Tennessee, Texas Regional Map V.
Southwestern States Southern US West of Mississippi River: Arkansas, Arizona, California, Colorado, Louisiana, Nevada, New Mexico, Oklahoma, Texas, Utah Regional Map II.
West All states west of the Mississippi River Regional Map I.


Regions of the United States I II III IV V

Geographic Location Index | The American Revolution and Its Era Home Page