How do you apply for an Employer Identification Number (EIN)?
Ask the IRS for Form SS-4. Form SS-4 is available by calling the IRS at (800) 829-1040 or through their Web site, http://www.irs.ustreas.gov.
After you’ve completed that form, you can get the EIN by mail, fax or phone. The instructions with your SS-4 provide you the proper phone numbers.
You may also want to ask the IRS for Publication 1635, Understanding Your EIN.
Source: Internal Revenue Service, November 25, 1998.