The U.S. Census Bureau defines the South as 16 states plus the District of Columbia—the largest Census region by both population and land area.
| State | Subregion (Census) |
|---|---|
| Alabama | East South Central |
| Arkansas | West South Central |
| Delaware | South Atlantic |
| Florida | South Atlantic |
| Georgia | South Atlantic |
| Kentucky | East South Central |
| Louisiana | West South Central |
| Maryland | South Atlantic |
| Mississippi | East South Central |
| North Carolina | South Atlantic |
| Oklahoma | West South Central |
| South Carolina | South Atlantic |
| Tennessee | East South Central |
| Texas | West South Central |
| Virginia | South Atlantic |
| West Virginia | South Atlantic |
DC is included in the South Atlantic division for statistical purposes.
Cultural/historical definitions of "the South" sometimes differ (e.g., excluding MD, DE, DC; including MO). The Census definition above is the federal statistical standard.