Understanding U.S. State and Territory Codes
Navigating forms, shipping packages, or even discussing geographical data often requires understanding U.S. State and territory codes. These standardized abbreviations and codes are essential for accurate data processing and communication. This article provides a comprehensive overview of these codes, covering states, districts, and U.S. Territories, as of March 26, 2026.
State Abbreviations
Each of the 50 U.S. States is assigned a unique two-letter abbreviation by the U.S. Census Bureau and the U.S. Postal Service. These abbreviations are widely used in various applications. Here’s a complete list:
- Alabama (AL)
- Alaska (AK)
- Arizona (AZ)
- Arkansas (AR)
- California (CA)
- Colorado (CO)
- Connecticut (CT)
- Delaware (DE)
- Florida (FL)
- Georgia (GA)
- Hawaii (HI)
- Idaho (ID)
- Illinois (IL)
- Indiana (IN)
- Iowa (IA)
- Kansas (KS)
- Kentucky (KY)
- Louisiana (LA)
- Maine (ME)
- Maryland (MD)
- Massachusetts (MA)
- Michigan (MI)
- Minnesota (MN)
- Mississippi (MS)
- Missouri (MO)
- Montana (MT)
- Nebraska (NE)
- Nevada (NV)
- New Hampshire (NH)
- New Jersey (NJ)
- New Mexico (NM)
- New York (NY)
- North Carolina (NC)
- North Dakota (ND)
- Ohio (OH)
- Oklahoma (OK)
- Oregon (OR)
- Pennsylvania (PA)
- Rhode Island (RI)
- South Carolina (SC)
- South Dakota (SD)
- Tennessee (TN)
- Texas (TX)
- Utah (UT)
- Vermont (VT)
- Virginia (VA)
- Washington (WA)
- West Virginia (WV)
- Wisconsin (WI)
- Wyoming (WY)
U.S. Territories and Other Areas
Beyond the 50 states, several U.S. Territories and other areas also have official codes. These are important for addressing and data collection purposes.
- District of Columbia (DC)
- Puerto Rico (PR)
- U.S. Virgin Islands (VI)
- Armed Forces Americas (AA)
- Armed Forces Pacific (AP)
- Armed Forces Europe (AE)
- Northern Mariana Islands (MP)
- Marshall Islands (MH)
- American Samoa (AS)
- Federated States of Micronesia (FM)
- Guam (GU)
- Palau (PW)
Geographic Regions and Divisions
For statistical purposes, the U.S. Census Bureau groups states and the District of Columbia into four regions and nine divisions. Understanding these groupings is crucial for analyzing regional trends and data.
The Four Regions
- Northeast: Connecticut, Maine, Massachusetts, New Hampshire, New Jersey, New York, Pennsylvania, Rhode Island, and Vermont.
- Midwest: Illinois, Indiana, Iowa, Kansas, Michigan, Minnesota, Missouri, Nebraska, North Dakota, Ohio, South Dakota, and Wisconsin.
- South: Alabama, Arkansas, Delaware, District of Columbia, Florida, Georgia, Kentucky, Louisiana, Maryland, Mississippi, North Carolina, Oklahoma, South Carolina, Tennessee, Texas, Virginia, and West Virginia.
- West: Alaska, Arizona, California, Colorado, Hawaii, Idaho, Montana, Nevada, New Mexico, Oregon, Utah, Washington, and Wyoming.
The Nine Divisions
- New England: Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, and Vermont
- Middle Atlantic: New Jersey, New York, and Pennsylvania
- East North Central: Illinois, Indiana, Michigan, Ohio, and Wisconsin
- West North Central: Iowa, Kansas, Minnesota, Missouri, Nebraska, North Dakota, and South Dakota
- South Atlantic: Delaware, District of Columbia, Florida, Georgia, Maryland, North Carolina, South Carolina, Virginia, and West Virginia
- East South Central: Alabama, Kentucky, Mississippi, and Tennessee
- West South Central: Arkansas, Louisiana, Oklahoma, and Texas
- Mountain: Arizona, Colorado, Idaho, Montana, Nevada, New Mexico, Utah, and Wyoming
- Pacific: Alaska, California, Hawaii, Oregon, and Washington
Recent Legal Developments & State Travel Restrictions
It’s worth noting that state travel restrictions can be implemented based on legal or political considerations. For example, in June 2017, California restricted state-funded travel to Alabama, Kentucky, South Dakota, and Texas due to discriminatory legislation enacted in those states. California Attorney General’s Office announced these restrictions.
Supreme Court Cases Involving States
Interstate legal disputes occasionally reach the Supreme Court. A case, Alabama v. California (03/10/2025), involved a motion for leave to file a bill of complaint, which was denied. Details of the case are available on the Supreme Court’s website.
Key Takeaways
- U.S. States and territories each have unique two-letter codes.
- The Census Bureau groups states into four regions and nine divisions for statistical analysis.
- State travel restrictions can be imposed based on political or legal factors.
- Interstate legal disputes can reach the Supreme Court.