| Bordering States | State |
| Washington, Utah | |
| Wyoming, Oklahoma | |
| Ohio, Wisconsin | |
| Kentucky, Oklahoma | |
| Texas, Tennessee | |
| North Carolina, South Carolina | |
| California, New Mexico | |
| Delaware, Virginia | |
| Mississippi, Virginia | |
| Louisiana, New Mexico | |
| Minnesota, Missouri | |
| Maine, Massachusetts | |
| Connecticut, Rhode Island | |
| Florida, Mississippi | |
| Rhode Island, Massachusetts | |
| Wisconsin, Kentucky | |
| | Bordering States | State |
| Virginia, Indiana | |
| North Dakota, Wisconsin | |
| North Dakota, Idaho | |
| Iowa, Michigan | |
| Vermont, New Jersey | |
| Washington, Idaho | |
| Kansas, South Dakota | |
| Delaware, Ohio | |
| Michigan, Indiana | |
| Colorado, Arkansas | |
| Iowa, Montana | |
| Maryland, Tennessee | |
| Massachusetts, New Hampshire | |
| South Dakota, Utah | |
| Georgia, Missouri | |
| Oklahoma, Mississippi | |
|