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I was doing a research project a little while ago and found out about FIPS 6-4 which is used to identify counties in the United States. I also understand that this standard is a bit out of date. Is there a similar standard for identifying cities?

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The U.S. Census Bureau used FIPS 55-3 for some time, and much information is still encoded as such. However it was discontinued, as it was volatile by design. It seems the replacement is called GNIS.

There's a FIPS-to-GNIS map available on Git.

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You might want to consider either of the following:

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