Warsaw
Urząd Stanu Cywilnego m.st. Warszawy – Białołęka
ul. Modlińska 197, Warsaw
You can apply at any registry in Poland, so you are not tied to your own Warsaw district.
Bring the relevant application, ID or passport, payment proof where required and evidence of legal interest if you lack statutory entitlement. A proxy needs authority. Ask for the correct format before paying: the optional multilingual standard form costs PLN 17, accompanies a short copy and is not valid alone; in Warsaw it cannot be requested through the online application.