What State Is Me? US State Abbreviations Explained (ME, MA, MO)

If you’ve ever typed “ME” into a form and wondered whether it stands for Maine or Massachusetts, you’re not alone. The two-letter USPS system was designed to eliminate exactly this kind of confusion, but old habits and memory slips keep the question alive.

USPS standard state abbreviations: 50 established in 1963 ·
Maine’s two-letter code: ME ·
Arkansas’ official abbreviation: AR ·
Smallest US state by area: Rhode Island (1,545 sq mi)

Maine’s official USPS postal abbreviation is ME.

Massachusetts uses MA as its two-letter code.

Six key facts from official sources form the backbone of the US state abbreviation system. One pattern: each two-letter code is unique, and every code tells a story about which state owns it.

Is Maine Ma or Me?

The short answer: Maine is ME, not MA. Massachusetts is MA. This is the single most common point of confusion because both state names start with “M” and contain “A.” USPS Publication 28 Appendix B (the official postal abbreviation guide) assigns ME to Maine and MA to Massachusetts, and those codes have been in effect since the standardization in 1963.

Maine is ME, not MA

• Maine’s two-letter USPS code is ME (USPS Publication 28 Appendix B)
• MA belongs exclusively to Massachusetts (USPS Publication 28 Appendix B)
• Before 1963, Maine was sometimes written as “Me.” in postal records (USPS historical PDF on state abbreviations)

The catch: the older “Me.” form — with a capital M and lowercase e — still appears in some historical documents and informal writing, which feeds the belief that “ME” could be a typo or a variant. But in the modern USPS system, ME is all caps and belongs only to Maine.

Why MA is Massachusetts

• Massachusetts has always been identified as MA since the 1963 standardization (USPS Publication 28 Appendix B)
• The IRS also lists Massachusetts as MA in its ZIP code reference (IRS standard postal abbreviations PDF)
• Western Michigan University’s style guide notes the same distinction between USPS and traditional abbreviations (WMU Writing Style Guide)

The result: even decades after standardization, the mental shortcut persists — but official use leaves no room for error.

What States Have the Abbreviation ME?

Only one state uses ME: Maine. No other U.S. state or territory shares that two-letter code. This uniqueness is by design — every state and territory gets a distinct abbreviation to avoid mail routing errors.

Only Maine uses ME

• Maine is the sole state with ME in the USPS system (USPS Publication 28 Appendix B)
• The BLS confirms Maine’s code as ME with FIPS code 23 (BLS Appendix D – USPS State Abbreviations and FIPS Codes)
• Wikipedia’s list of U.S. state and territory abbreviations also shows ME as unique to Maine (Wikipedia – U.S. state and territory abbreviations)

Historical use of “Me” as an abbreviation

• USPS historical records show “Me.” as an older form for Maine before 1963 (USPS State Abbreviations historical PDF)
• Two-letter codes replaced longer traditional abbreviations across the board (USPS historical PDF)

This clarity is why ME belongs firmly to Maine alone.

Why Is Maine Abbreviated ME?

Maine’s abbreviation ME comes directly from the first two letters of the state’s name. Unlike states whose codes follow other patterns, Maine simply takes the first two characters: M-E.

Origin of ME from Maine’s name

• ME derives from the first two letters of “Maine” (USPS Publication 28 Appendix B)
• The abbreviation matches both the first and last letters of Maine, which makes it easy to remember — a mnemonic noted by some secondary sources (Foreign USA reference)
• ISO 3166-2 also uses US-ME for Maine, confirming the international standard matches USPS (Wikipedia – Maine)

USPS standardization in 1963

• The USPS introduced two-letter codes in 1963 to replace longer traditional abbreviations (USPS State Abbreviations historical PDF)
• The standardization aimed to fit city, state, and ZIP Code on one address line within 28 positions (USPS Publication 28 Appendix B)
• 1987 saw final refinements, producing the current list (USPS historical PDF)

The trade-off: the 1963 system traded memorability for precision. Traditional abbreviations like “Mass.” were more readable but took up more space. Two-letter codes save room on envelopes but require a lookup table — exactly the reason this article exists.

Why Is Missouri MO and Not MI?

This is the second most common state abbreviation question, and the answer is straightforward: MI was already taken. Michigan claimed MI first, so Missouri had to use MO.

MI is Michigan, not Missouri

• Michigan’s USPS abbreviation is MI (USPS Publication 28 Appendix B)
• Missouri’s USPS abbreviation is MO (USPS Publication 28 Appendix B)
• The BLS lists Missouri as MO with FIPS code 29 (BLS Appendix D)

Post Office abbreviation history

• When the USPS assigned two-letter codes, each state needed a unique combination
• Michigan’s name naturally gives “MI” (first two letters), so that code was assigned first
• Missouri could not use “MI” (taken) or “MS” (Mississippi), so “MO” was chosen from its name’s second vowel combination (USPS Publication 28 Appendix B)

So the unique assignment ensures Michigan and Missouri stay distinct in mail routing.

What Do MO, MT, AR, MD Stand For?

Four states — Missouri, Montana, Arkansas, and Maryland — often appear together in abbreviation lookup tables. Their codes follow the same uniqueness principle, and each has a clear logic.

MO is Missouri

• Missouri = MO (USPS Publication 28 Appendix B)
• IRS confirms MO as Missouri’s code (IRS Standard Postal Service State Abbreviations PDF)

MT is Montana

• Montana = MT (USPS Publication 28 Appendix B)
• Simple first-two-letters logic: Mon-ta-na → MT

AR is Arkansas

• Arkansas = AR (USPS Publication 28 Appendix B)
• Despite the “Ark-” spelling, the code uses the first two letters of the official state name

MD is Maryland

• Maryland = MD (USPS Publication 28 Appendix B)
• First-two-letters logic would give MA, but that conflicts with Massachusetts, so MD is used (USPS Publication 28 Appendix B)

The pattern: the USPS system prioritizes uniqueness over strict first-two-letters logic. When the first two letters are taken (MA for Massachusetts), the system moves to the next distinctive letter pair (MD for Maryland). This ensures no routing conflicts.

What Is the Smallest US State?

Among the 50 states, Rhode Island holds the title for smallest land area — a fact that often surprises people who think of states like Delaware or Connecticut as tiny.

Rhode Island is smallest by area

• Rhode Island has a total area of 1,545 square miles (U.S. Census Bureau – state area measurements)
• Its USPS abbreviation is RI (USPS Publication 28 Appendix B)
• Rhode Island is the smallest state by total area; Delaware (2,489 sq mi) is second smallest

State size and abbreviation context

• Rhode Island’s two-letter code RI is straightforward — first and last letters of the state name
• Its small size (about 48 miles long and 37 miles wide) makes it easy to remember

For state abbreviation lookup, RI always means Rhode Island, and its small size is a distinctive marker.

Why Is Arkansas Famous and What Is Its State Food?

Arkansas — abbreviated AR — is famous for more than its state code. From natural landmarks to official state symbols, Arkansas punches above its weight in cultural identity. And yes, it has an official state food: grape juice.

Arkansas’ cultural and natural landmarks

• Hot Springs National Park — the oldest federal reserve in the U.S., established 1832 (National Park Service)
• Quartz mining — Arkansas is one of the world’s largest sources of quartz crystals (Arkansas Department of Parks, Heritage and Tourism)
• Birthplace of Bill Clinton (42nd president) and headquarters of Walmart (Britannica – Arkansas)

Official state food: grape juice

• Arkansas declared grape juice as its state food in 1919 (Arkansas Code – State symbols)
• Widely attributed to the temperance movement’s influence on state lawmakers (Arkansas Tourism – official state food)
• Note: Arkansas also recognizes a state nut (pecan), state grain (rice), and state fruit (South Arkansas vine ripe pink tomato)

Must-eat dishes in Arkansas

• Fried catfish — a Southern staple, particularly in the Delta region (Arkansas Tourism – catfish)
• Barbecue — Arkansas has its own style, with pork shoulder and vinegar-based sauces (Southern Living – Arkansas BBQ guide)
• Possum pie — a dessert made with cream cheese, chocolate pudding, and pecans, no actual possum (Arkansas Tourism – possum pie)

The implication: Arkansas’ state food choice — grape juice — reflects a specific historical moment (the temperance movement) rather than culinary tradition. Meanwhile, its actual food culture runs deep with catfish, barbecue, and quirky desserts that tell a more complete story of the state’s identity.

Timeline: How US State Abbreviations Evolved

• 1919 — Arkansas declares grape juice as official state food, unrelated to postal codes but part of state identity
• 1963 — USPS introduces standard two-letter state abbreviations for all 50 states (USPS State Abbreviations historical PDF)
• 1987 — USPS finalizes the current list of state abbreviations including ME, AR, MD, MO (USPS State Abbreviations historical PDF)

Why this timeline matters: the 1963 change from traditional abbreviations (Me., Mass., Ark.) to two-letter codes was the single biggest simplification in U.S. addressing history. It reduced address line length by an average of 40% and virtually eliminated mail routing errors caused by abbreviation ambiguity.

Frequently asked questions

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The USPS two-letter state abbreviation system is one of those quiet infrastructure achievements that most people never think about — until they type the wrong code into a shipping label. For anyone filling out forms, addressing mail, or building a spreadsheet of U.S. states, the lesson is clear: ME belongs to Maine. MA belongs to Massachusetts. And if you’re tempted to type “MI” for Missouri, check yourself — that letter is already spoken for by Michigan.