Even if your "SO" does not have a SS number you SHOULD file married. To do so you need a W-7 "ITIN"[1] which will replace the required Social Security #.
Option 1 is Married filing Separately. This is the easiest way and will give you around $400 more on your taxes for your wife.
According to publication 519 page 26 [2]
"You can claim personal exemptions and exemptions for dependents according to the dependency rules for U.S. citizens. You can claim an exemption for your spouse on a separate return if your spouse had no gross income for U.S. tax purposes and was not the dependent of another taxpayer. You can claim this exemption even if your spouse has not been a resident alien for a full tax year or is an alien who has not come to the United States."
Option 2 is Married filing Jointly.
See page 10 [3]
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NOTE: The above information does not address the specific requirements for any given case and is not a substitute for the advice of an attorney.