Figure 2: 2018 NIS States, by Census Division
| U.S. Region |
Census Division |
States in HCUP |
States not in NIS |
| Region 1 (Northeast) |
Division 1 (New England) |
CT, MA, ME, NH, RI, VT |
n/a |
| Division 2 (Mid Atlantic) |
NJ, NY, PA |
n/a |
| Region 2 (Midwest) |
Division 3 (East North Central) |
IN, IL, MI, OH, WI |
n/a |
| Division 4 (West North Central) |
IA, KS, MN, MO, ND, NE, SD |
n/a |
| Region 3 (South) |
Division 5 (South Atlantic) |
DC, DE, FL, GA, MD, NC, SC, VA, WV |
n/a |
| Division 6 (East South Central) |
KY, MS, TN |
AL |
| Division 7 (West South Central) |
AR, LA, OK, TX |
n/a |
| Region 4 (West) |
Division 8 (Mountain) |
AZ, CO, MT, NM, NV, UT, WY |
ID |
| Division 9 (Pacific) |
AK, CA, HI, OR, WA |
n/a |