City of Sydney Relationships Declaration
Other institutions such as the Registry of Births Deaths and Marriages no longer accepts an Australian Marriage Certificate as a form of ID – this creates an equal situation for both opposite sex and same sex couples as both are not allowed to present their relationship certificates as a form of ID.
Identity document
A Social Security number does not prove any form of residency, and neither does a passport, as neither of these documents is tied to a specific jurisdiction apart from the US as a whole, and a person can be issued either of these without living in the US (such as being born abroad to American citizen parent(s). Thus, "residency in the US" is not clearly defined, and determining this often depends on the particular administrative process at hand.