No, you cannot file as single if you are still married.
If you have dependents and pay more than half of the cost of keeping up your house, and haven't lived with your spouse for 5 years, you could possibly file as Head of Household.
Your only other option is to file as Married Filing Separately. If you do not have qualifying dependents, this will be your only option. If you are unable to get his SSN, then you will need to print and mail your return and write on it that you are unable to obtain his SSN while including all the information you have such as name and address if you have it.
Did you by any chance select that you were single last year or other years? If so, this would be why TurboTax did not ask for his SSN, however, this would be an incorrect filing status if you were still legally married.
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