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I live in the States. Or I live in The States.

I live in USA or I live in the USA.

I live in the United States of America or I live in United States of America.

I live in America.

Could you please tell me the correct answers?
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I live in the States. (very informal)

I live in the USA.

I live in the US. (somewhat informal)

I live in the United States of America. (formal)

I live in America. (Used a lot to mean "I live in the USA" even though geographically America is a continent. If you live in Peru, you live in America, South America to be exact. Many geographers would say you live in America even if you live in Greenland as Greenland is not a continent and is considered part of America geographically.)

CB
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michaeltingI live in USA ... I live in United States of America.
These, without the, are wrong. I say "in the U.S." or "in the United States". I almost never say "of America" at the end, though that's OK if you want to add it.

CJ
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 CalifJim's reply was promoted to an answer.
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