Is it still true? No passport to travel to Puerto Rico>?

It depends... traveling from where to Puerto Rico?

If traveling from US to Puerto Rico, the flight is domestic and passport is not  required.  If traveling from  foreign country to Puerto Rico, then yes, a passport will be required.

Yes you do not need a passport to travel to Puerto Rico.

Here's another big surprise: New Mexico is part of the USA, too.

It is so sad that people don’t realize that we are American Citizens, go back to the history, please ask questions that have common sense.

Yes, Puerto Rico is part of the US.

If you're travelling from another part of the US, it's true. If you're travelling from any other country EXCEPT for the US, you will need a passport.

If you're a U.S. citizen, you don't need a passport for PR. PR is part of the U.S.

If you are not a U.S. citizen, you will require a passport and possibly a visa.

As an American, you do not need one. However, you are required to have other government identifying documents such as a drivers license. You will not require a passport to travel to Puerto Rico. ... If you are not American, you still will require a passport, but you probably already know that.

Yes, it is quite true. Also, no passport need for ANY US territory.

yes it is still true, PR is a extension of the US