Yes, you can. I am going through the process right now and this is what the Portuguese consulate in San Francisco told me I needed as of Feb. of this year. However, if you live anywhere near a consulate it probably wouldn't hurt to go in and double check if anything has changed (if nothing else I'm sure the prices will). If you can't go in, try calling them. At the San Francisco office they never answer the phone but the following information listed on their phone tape was identical to the handout they gave me.
If your parent's marriage has NOT been registered in Portugual, before you can apply for Portuguese citizenship you need to do that.
To register parent's marriage:
- parent's birth certificates (if Portuguese, issued within 6 months). You can request Portuguese birth certificates online through the official Portal do Cidad√£o website. You can register here in English but every other part of the site is in English. https://www.portaldocidadao.pt/PORTAL/pt/AreaUtilizadores/Registo/Registo_p1?JS
-certified copy of your parent's marriage certificate
-check for $141.26 payable to ‚ÄúConsulate General of Portugal‚ÄĚ(double check the current price)
After parent's marriage is registered you need to request a new copy of the Portuguese parent(s) birth certificate(s) with the marriage amended.
Then to register your birth:
-certified copy of your birth certificate
-applicant's copy of passport
-birth certificate of parents (if Portuguese, a "Narrative" certificate issued within 6 months with the marriage amended (AFTER the marriage is registered in Portugual)
-if applicant is married, certified copy of marriage certificate
-address and phone numbers of applicants and parents
-check for $379.94 payable to ‚ÄúConsulate General of Portugal‚ÄĚ
The above paperwork does not need to be submitted in person but can be sent to consul by mail.
However, to apply for your ID card aka Bilhete de Identidade (which is currently being phased out in favor of the more technologically-advanced Cart√£o de Cidad√£o aka Citizen Card) you do need to go in person because they require taking a fingerprint.
You also need to go in person to apply for your passport as they also take a fingerprint and a digital picture.
Hope this helps!