You cannot change your ZIP code, or anything else on your tax return, after you've filed it.
However, while it is not ever possible to be absolutely, positively, 100%
sure, this probably should not delay or impact your tax refund in any
way. As long as your name, Social Security Number (SSN) and other tax
data on your return are correct, then an incorrect (or mistyped) postal
ZIP code alone should not matter.
In fact, if you filed in such a way as to request an electronic tax refund sent directly to your bank (or anything other than a paper check), then the IRS wouldn't even need to look at, or use, your ZIP code at all. They will just use your bank account and routing numbers. Only in the instance if they were to mail you a paper refund or a letter would the ZIP code ever be used by the IRS. And even in that event, as long as your street address (e.g., 1234 Easy Street), city, and state are correct, then the IRS can standardize and correct the ZIP code as they may need.
In fact, the USPS (Postal Service) has such a free tool for correcting and finding accurate ZIP codes on their website.
https://tools.usps.com/go/ZipLookupAction!input.action
Certainly, the IRS is smart enough to use that, or a database very similar, should the need arise.
In other words, you should not worry about this. Typographical errors happen all of the time.
Thanks for asking this question.
You cannot change your ZIP code, or anything else on your tax return, after you've filed it.
However, while it is not ever possible to be absolutely, positively, 100%
sure, this probably should not delay or impact your tax refund in any
way. As long as your name, Social Security Number (SSN) and other tax
data on your return are correct, then an incorrect (or mistyped) postal
ZIP code alone should not matter.
In fact, if you filed in such a way as to request an electronic tax refund sent directly to your bank (or anything other than a paper check), then the IRS wouldn't even need to look at, or use, your ZIP code at all. They will just use your bank account and routing numbers. Only in the instance if they were to mail you a paper refund or a letter would the ZIP code ever be used by the IRS. And even in that event, as long as your street address (e.g., 1234 Easy Street), city, and state are correct, then the IRS can standardize and correct the ZIP code as they may need.
In fact, the USPS (Postal Service) has such a free tool for correcting and finding accurate ZIP codes on their website.
https://tools.usps.com/go/ZipLookupAction!input.action
Certainly, the IRS is smart enough to use that, or a database very similar, should the need arise.
In other words, you should not worry about this. Typographical errors happen all of the time.
Thanks for asking this question.