Married but have never lived together, are we "considered unmarried" or should we file married/separately?

We married in November 2011. We have never lived together. We have 2 separate households. Do we qualify for single filing because we are "considered unmarried" or should we do married filing separately?

Also, I worked in a separate state for half of 2011 and need to file 2 different state returns. Should I file single for state returns?
    If you are married, you can file either Married Filing Jointly or Married Filing Separately.  Jointly has the better tax rates and credits.  Jointly is usually the better way to file if you can agree with your spouse.

    There is so filing status "considered unmarried".

    You might be considered unmarried and be able to file as Head of Household, if your spouse did not live with you even for one night for the last 6 months of 2011 and you have a dependent child living in your household for more than 1/2 the year.

    Here are the rules for filing HOH:

    You may be able to file as head of household if you meet all the following requirements.

    1. You are unmarried or “considered unmarried” on the last day of the year.
     (You could be considered unmarried if your spouse did not live in your home at any time during the last 6 months of the tax year).

    2. You paid more than half the cost of keeping up a home for the year.

    3. A “qualifying person”  lived with you in the home for more than half the year (except for temporary absences such as school) - a parent does not have to live with you to be a qualifying person.

    4. If the qualifying person is your qualifying relative, their gross income must have been less than $3,700 (do not include non taxable Social Security) and you provided more than 1/2 of their support

    A Qualifying person is either:

    A qualifying child or a qualifying closely related relative and meets certain other requirements, however if you are considered unmarried it can only be your child, stepchild, or foster child.  See IRS Publication 17 for more information about who is a qualifying person.
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