Do not worry about the zipcode. The employer's EIN is what matters. Was that entered correctly?
Wait----do you mean your own W-2 that you entered for your own employment?
Or.....do you mean YOU are the employer and you used the wrong zip code on W-2's you issued to your employees?
I just noticed that you posted from TT Business.
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.)
I am the employer and entered my company zip code wrong and did not see the error until after efiling the w2's
As long as you have all of the relevant information, such as recipients' social security numbers, your Federal Employer Identification Number (FEIN), state withholding ID #, amounts, paid & withheld, etc., you don't need to do anything.