| Regions of the United States | |
|
|
|
|
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 | |
| East | All states east of the Mississippi River | |
| Middle Atlantic States | Delaware, District of Columbia, Maryland, New Jersey, New York, Pennsylvania | |
| 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 | |
| New England | Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, Vermont | |
| 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 | |
| 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 | |
| Northwest, Pacific | Old Oregon country: Idaho, Oregon, Montana, Washington, Wyoming | |
| Pacific States | Alaska, California, Hawaii, Oregon, Washington | |
| Rocky Mountain Region | Arizona, Colorado, Idaho, Montana, Nevada, New Mexico, Utah, Wyoming |
|
| South Atlantic States | Florida, Georgia, North Carolina, South Carolina, Virginia | |
| 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 | |
| Southwest, New | Corresponds to old Spanish province of New Mexico including Arizona, California, Colorado, Nevada, New Mexico, and Utah | |
| Southwest, Old | Southwestern US before cessions of land from Mexico following Mexican War: Arkansas, Kentucky, Louisiana, Missouri, Tennessee, Texas | |
| Southwestern States | Southern US West of Mississippi River: Arkansas, Arizona, California, Colorado, Louisiana, Nevada, New Mexico, Oklahoma, Texas, Utah | |
| West | All states west of the Mississippi River | |
| Regions of the United States | I | II | III | IV | V |