Here's a list of the official two-letter abbreviations used by the US Postal Service
Abbreviation = State/Possession
AL = ALABAMA
AK = ALASKA
AS = AMERICAN SAMOA
AZ = ARIZONA
AR = ARKANSAS
CA = CALIFORNIA
CO = COLORADO
CT = CONNECTICUT
DE = DELAWARE
DC = DISTRICT OF COLUMBIA
FM = FEDERATED STATES OF MICRONESIA
FL = FLORIDA
GA = GEORGIA
GU = GUAM
HI = HAWAII
ID = IDAHO
IL = ILLINOIS
IN = INDIANA
IA = IOWA
KS = KANSAS
KY = KENTUCKY
LA = LOUISIANA
ME = MAINE
MH = MARSHALL ISLANDS
MD = MARYLAND
MA = MASSACHUSETTS
MI = MICHIGAN
MN = MINNESOTA
MS = MISSISSIPPI
MO = MISSOURI
MT = MONTANA
NE = NEBRASKA
NV = NEVADA
NH = NEW HAMPSHIRE
NJ = NEW JERSEY
NM = NEW MEXICO
NY = NEW YORK
NC = NORTH CAROLINA
ND = NORTH DAKOTA
MP = NORTHERN MARIANA ISLANDS
OH = OHIO
OK = OKLAHOMA
OR = OREGON
PW = PALAU
PA = PENNSYLVANIA
PR = PUERTO RICO
RI = RHODE ISLAND
SC = SOUTH CAROLINA
SD = SOUTH DAKOTA
TN = TENNESSEE
TX = TEXAS
UT = UTAH
VT = VERMONT
VI = VIRGIN ISLANDS
VA = VIRGINIA
WA = WASHINGTON
WV = WEST VIRGINIA
WI = WISCONSIN
WY = WYOMING
Hopes that helps some.
Chafu213
Regions Defined
The regions of the United States are geographic areas which include multiple states. The regional groupings presented here and their definitions are from standard language used by libraries and reflect the groupings used in the classification system for maps.
Region/Definition
Atlantic States/All states Maine to Florida that are near to or border on
Atlantic Ocean
East/All states east of the Mississippi River
Middle Atlantic States/Delaware, District of Columbia, Maryland, New Jersey,
New York, Pennsylvania
Middle West/Rocky Mountains to Allegheny Mountains, North of Ohio River
and southern border of Missouri and Kansas: Illinois, Iowa,
Indiana, Kansas, Michigan, Minnesota, Missouri, Nebraska,
North Dakota, Ohio, South Dakota, Wisconsin
New England/Connecticut, Maine, Massachusetts, New Hampshire, Rhode
Island, Vermont
Northeastern States/East of Mississippi River, North of Ohio and Potomac
Rivers: Connecticut, Delaware, District of Columbia,
Illinois, Indiana, Maine, Maryland, Massachusetts,
Michigan, New Hampshire, New Jersey, New York, Ohio,
Pennsylvania, Rhode Island, Vermont, Wisconsin
Northwestern States/Northern part of US between western edge of Lake
Superior and Pacific Ocean: Idaho, Iowa, Kansas,
Minnesota, Missouri, Montana, Nebraska, North
Dakota, Oregon, South Dakota, Washington,
Wyoming
Northwest Pacific/Old Oregon country: Idaho, Oregon, Montana,
Washington, Wyoming
Pacific States/Alaska, California, Hawaii, Oregon, Washington
Rocky Mountain Region/Arizona, Colorado, Idaho, Montana, Nevada, New
Mexico, Utah, Wyoming
South Atlantic States/Florida, Georgia, North Carolina, South Carolina,
Virginia
Southern States/South of Mason-Dixon Line and Ohio River, from western
Texas border to the Atlantic Ocean: Alabama, Arkansas,
Florida, Georgia, Kentucky, Louisiana, Mississippi, North
Carolina, Oklahoma, South Carolina, Tennessee, Texas,
Virginia, West Virginia
Southwest, New/Corresponds to old Spanish province of New Mexico
including Arizona, California, Colorado, Nevada, New
Mexico, and Utah
Southwest, Old/Southwestern US before cessions of land from Mexico
following Mexican War: Arkansas, Kentucky, Louisiana,
Missouri, Tennessee, Texas
Southwestern States/Southern US West of Mississippi River: Arkansas,
Arizona, California, Colorado, Louisiana, Nevada, New
Mexico, Oklahoma, Texas, Utah
West /All states west of the Mississippi River
Chafu213
