The zip code error is probably immaterial. Below is Ernst & Young's take:
Error in employer name or address
The Form W-2 should reflect the employer’s name and address as shown on Forms 941, 941-SS, 943, 944, CT 1 or Schedule H (Form 1040). There is no mechanism for showing the previously reported and correct employer name or address on the Form W-3c. The IRS states it will not use the Form W-3c to correct the employer’s address of record. Instead, a change in the employer’s address is made by filing Form 8822-B, Change of Address or Responsible Party-Business, with the IRS. (General Instructions for Forms W-2 and W-3.)
Whether a penalty will apply for incorrectly reporting the employer’s name is uncertain. The IRS states in the Form W-2 instructions that an inconsequential error or omission is not considered a failure to include correct information for purposes of imposing the penalties under IRC §6721 and §6722.
An inconsequential error or omission is defined by the IRS as one that does not prevent or hinder the SSA or IRS from processing the Form W-2, from correlating the information required to be shown on the form with the information shown on the payee’s tax return or from otherwise putting the form to its intended use.
Errors and omissions that are never inconsequential are those relating to:
• A Tax Identification Number
• A payee’s surname
• Any money amounts (but see page 8 concerning de minimis errors)
(General Instructions for Forms W-2 and W-3.)
