How can I get my taxes filed if I'm unable to access my estranged husband's-more than 10 years now-social security number?

[chonjayy]

I have had no contact whatsoever with my estranged husband for more than ten years now, and I don't have any information of his whereabouts or if he's still in this country or alive.

[MaryK4]

You will have to print and mail your return and write UNKNOWN in the social security number box for your husband.