REGIONUS
Region, United States

Codes

Northeast Region
11   New England division
12   Middle Atlantic division
13   Northeast, n.s.
Midwest Region
21   East North Central division
22   West North Central division
23   Midwest, n.s.
South Region
31   South Atlantic division
32   East South Central division
33   West South Central division
34   South, n.s.
West Region
41   Mountain division
42   Pacific division
43   West, n.s.
Region Unknown
91   Military/military reservations
92   PUMA boundaries cross state lines
97   State not identified
99   Inter-regional county group