| 1 | New-England | Connecticut (CT), Maine (ME), Massachusetts (MA), New Hampshire (NH), Rhode Island (RI), Vermont (VT) |
| 2 | Middle-Atlantic | New Jersey (NJ), New York (NY), Pennsylvania (PA) |
| 3 | East-North-Central | Illinois (IL), Indiana (IN), Michigan (MI), Ohio (OH), Wisconsin (WI) |
| 4 | West-North-Central | Iowa (IA), Kansas (KS), Minnesota (MN), Missouri (MO), Nebraska (NE), North Dakota (ND), South Dakota (ND) |
| 5 | South-Atlantic | Delaware (DE), District of Columbia (DC), Florida (FL), Georgia (GA), Maryland (MD), North Carolina (NC), South Carolina (SC), Virginia (VA), West Virginia (WV) |
| 6 | East-South-Central | Alabama (AL), Kentucky (KY), Mississippi (MS), Tennessee (TN) |
| 7 | West-South-Central | Arkansas (AR), Louisiana (LA), Oklahoma (OK), Texas (TX) |
| 8 | Mountain | Arizona (AZ), Colorado (CO), Idaho (ID), Montana (MT), Nevada (NV), New Mexico (NM), Utah (UT), Wyoming (WY) |
| 9 | Pacific | Alaska (AK), California (CA), Hawaii (HI), Oregon (OR), Washington (WA) |
