What can I use as proof of citizenship to enter Mexico?

In general to enter Mexico you need to obtain a Tourist Card (FMT). To get your Tourist Card you will need to prove citizenship, a passport is best for this purpose. Other forms of accepted proof of citizenship include (Citizens from USA and Canada), certified birth certificate, voter's registration card, naturalization papers or a notarized affidavit of citizenship. A photo ID is very helpful, a passport can serve as proof of citizenship and photo ID. Airlines will provide the blank Tourist Card to fill out.

Canadian Citizens (adults):
1. Passport or
2. Certified birth certificate + photo ID card

USA Citizens (adults):
1. Passport or
2. Certified birth certificate + photo ID card or notarized affidavit of citizenship

When traveling with children (Citizens from USA and Canada), if your children are not included in your family passport, depending on your case you may need one of the following:

1. Affidavit of Sole Custody (in case of a divorced couple);
2. Affidavit of Parental Consent for Unaccompanied Minor (minor traveling alone without either parent); and
3. Affidavit for Other Parental Custody (minor traveling with only one parent, but parents still married).

Minors traveling alone (Citizens from USA and Canada - under 18 years of age) need:

1. Passport
2. Two affidavits, one from each parent authorizing him/her to leave the country, where the minor is traveling from and who will pick the minor up at the airport.

Citizens of other countries please contact your local Embassy or Consulate for Passport and visa requirements.

Be sure to save the blue copy, as you must present this copy when leaving Mexico.The blue piece of paper you are given when you enter the country is your Tourist Card, and it's very important that you don't lose it. You can get another, but the process is complicated, and you'll spend too much of your vacation in government offices and line-ups. Keep it in a safe place until you leave. Along with your passport and other documentation, preferably a hotel security box.