The Employer's zip code does not have to match the state in Box 15 (the state where you earned the income).
It doesn't matter what state the Payer (or Employer) is located in, it only matters where you earned the income.
You won't have to report the income to the state that the Employer is located in.
Enter your W-2 exactly as it is is shown on the form.
Click this link for info on How to Manually Enter a W-2.
If this doesn't resolve your issue, Delete the W-2 and re-enter it.
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