These are the REGIONS commonly referred to in the US Census:
NORTHEAST (NE) 9 states (ME, NH, VT, MA, RI, CT, NY, PA, NJ)
Maine, New Hampshire, Vermont, Massachusetts, Rhode Island,
Connecticut, New York, Pennsylvania, New Jersey
SOUTH (S) 16 states
(DE, MD, WV, VA, NC, SC, GA, FL, AL, MS, TN, KY, AR, LA, TX, OK)
Delaware, Maryland, West Virginia, Virginia, North Carolina,
South Carolina, Georgia, Florida, Alabama, Mississippi,
Tennessee, Kentucky, Arkansas, Louisiana, Texas, Oklahoma
MIDWEST (MW) 12 states
(MI, OH, IN, IL, WI, MN, IA, MO, ND, SD, NE, KS)
Michigan, Ohio, Indiana, Illinois, Wisconsin, Minnesota, Iowa,
Missouri, North Dakota, South Dakota, Nebraska, Kansas,
WEST (W) 13 states
(WA, OR, CA, NV, ID, UT, AZ, MT, WY, CO, NM, HI, AK)
Washington, Oregon, California, Nevada, Idaho, Utah, Arizona,
Montana, Wyoming, Colorado, New Mexico, Hawaii, Alaska
November 7, 1991 release date:1990 POPULATION FOR ALL PERSONS
United States
Regions and Divisions
States
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Estimate of 12/29/94 261,653,497
United States 248,709,873
Northeast Region 50,809,229
New England Div. 13,206,943
Middle Atlantic Div. 37,602,286
Midwest Region 59,668,632
East North Central 42,008,942
West North Central 17,659,690
South Region 85,445,930
South Atlantic Div. 43,566,853
East South Central 15,176,284
West South Central 26,702,793
West Region 52,786,082
Mountain Division 13,658,776
Pacific Division 39,127,306
Maine 1,227,928
New Hampshire 1,109,252
Vermont 562,758
Massachusetts 6,016,425
Rhode Island 1,003,464
Connecticut 3,287,116
New York 17,990,455
New Jersey 7,730,188
Pennsylvania 11,881,643
Ohio 10,847,115
Indiana 5,544,159
Illinois 11,430,602
Michigan 9,295,297
Wisconsin 4,891,769
Minnesota 4,375,099
Iowa 2,776,755
Missouri 5,117,073
North Dakota 638,800
South Dakota 696,004
Nebraska 1,578,385
Kansas 2,477,574
Delaware 666,168
Maryland 4,781,468
District of Columbia 606,900
Virginia 6,187,358
West Virginia 1,793,477
North Carolina 6,628,637
South Carolina 3,486,703
Georgia 6,478,216
Florida 12,937,926
Kentucky 3,685,296
Tennessee 4,877,185
Alabama 4,040,587
Mississippi 2,573,216
Arkansas 2,350,725
Louisiana 4,219,973
Oklahoma 3,145,585
Texas 16,986,510
Montana 799,065
Idaho 1,006,749
Wyoming 4