EIN's are just like SSN's and are not publicly available. If you have a legal need for it (and you do) then it will be on the W-2 when you receive it. You can't *CORRECTLY* complete your tax return until you have that W-2. Issuer's have until Jan 31st to mail you the W-2. So you should have it in your possession by the end of the first week of Feb at the absolute latest. This is of course, assuming you provided the issuer the correct mailing address for them to send the W-2 to.
