If I'm a US citizen living outside of the US, which address should I use?
You should use the same address that you intend to use for your visa application, keeping in mind that the address that you use for your visa application dictates which embassy / consulate you need to submit your application to.
For example, if you are a US citizen living in Mexico and would like to
apply for the D7 visa through the Portugal embassy in Mexico City, you will need to use your address in Mexico rather than a US one.
If you have any questions regarding your specific situation, we recommend that you contact the Portugal embassy / consulate nearest to your residential address.