ZIP Codes in Wausau, WI
Wausau uses 2 ZIP codes, all in Marathon County. Pick one below for details, or look up the full nine-digit ZIP+4 for a specific street address.
All 2 Wausau ZIP codes
| ZIP | Type | County | Population |
|---|---|---|---|
| 54401 | standard | Marathon | 31,692 |
| 54403 | standard | Marathon | 24,950 |
Finding a ZIP+4 in Wausau
Knowing which of these 2 ZIP codes covers an address only gets you partway. The four-digit extension identifies the specific delivery point — typically one side of one block. Two houses facing each other on the same Wausau street almost always have different ZIP+4 codes even though they share all five leading digits.
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