Must you be a United States citizen to sign up for the NYPD. Or can you sign up if you only reside in the United States? Thank you.

You can "sign up" or apply to take the test as a permanent resident, but you have to be a citizen to be hired.

That is correct. According to their website, you don't have to a U.S. citizen to take the written test, but you must be a U.S. citizen when you are hired.

Some will, but very few police departments in the U.S. will hire non-citizens.

You have to be a citizen to get hired. The NYPD has to get about a million applicants!