I mailed my federal tax with w-7 form, now I have ITIN number for my wife. Can I submit my state tax electronically now that I have the ITIN number?

[Carl]

No. You have already mailed it to the IRS. If you e-file it, then the IRS will have received your return twice and that will automatically flag your account for possible fraud. This can delay any refund you are due for months, if not years. Leave well enough alone and be patient. Since the IRS is the only entity that issues ITIN numbers, they have already added it to your mailed return for you. It can take 16 weeks or longer after you mailed it, before you get any refund due.

[xmasbaby0]

It is not possible to e-file a state return if you did not e-file your federal return.  When you submit your state return, it will have to be printed, signed and mailed.