Table 1.
Nine US census divisions used for ILINet baseline calculations
| Northeast Region |
| New England Division: Maine, New Hampshire, Vermont, Massachusetts, Rhode Island, Connecticut |
| Middle Atlantic Division: New York, New Jersey, Pennsylvania |
| Midwest Region |
| East North Central Division: Ohio, Indiana, Illinois, Michigan, Wisconsin |
| West North Central Division: Minnesota, Iowa, Missouri, North Dakota, South Dakota, Nebraska, Kansas |
| South Region |
| South Atlantic Division: Delaware, Maryland, District of Columbia, North Carolina, South Carolina, Georgia, Florida |
| East South Central Division: Kentucky, Tennessee, Alabama, Mississippi |
| West South Central Division: Arkansas, Louisiana, Oklahoma, Texas |
| West Region |
| Mountain Division: Montana, Idaho, Wyoming, Colorado, New Mexico, Arizona, Utah, Nevada |
| Pacific Division: Washington, Oregon, California, Alaska, Hawaii |