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Are State Abbreviations Capitalized? | Uppercase Rule

Yes, USPS state abbreviations are written in all caps (CA, NY); book-style abbreviations are capitalized too, yet they often use periods and lowercase letters. You’ve seen both forms: “Austin, TX” on an envelope, and “Austin, Tex.” in older writing. That mismatch makes people pause and ask the same thing: are state abbreviations capitalized? The short

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