The South is the largest U.S. Census region by number of states, containing 16 states (plus District of Columbia).
| Region | States | Count |
|---|---|---|
| South | TX, OK, AR, LA, MS, AL, TN, KY, WV, VA, NC, SC, GA, FL, MD, DE (+ DC) | 16 |
| Midwest | OH, MI, IN, IL, WI, MN, IA, MO, ND, SD, NE, KS | 12 |
| West | MT, WY, CO, NM, ID, UT, AZ, NV, WA, OR, CA, AK, HI | 13 |
| Northeast | ME, NH, VT, MA, RI, CT, NY, NJ, PA | 9 |
Other frameworks (time zones, cultural regions, federal districts) yield different groupings. The Census Bureau's four-region model is the standard for statistical comparison.