The more the merrier! You can use addresses and phone numbers from guests around the world.
However, our guest addressing tool is formatted for US addresses. When you order your invitations, we recommend you review and correct the addresses for your international guests to ensure they are appearing correctly.
If you're unsure how to format your international addresses, take a peek at this USPS FAQ.
If you have more questions on international guests (or anything else) just contact us!