ZIP Codes in Amherst Junction, WI
Amherst Junction uses 1 ZIP code, all in Portage County. Pick one below for details, or look up the full nine-digit ZIP+4 for a specific street address.
All 1 Amherst Junction ZIP codes
| ZIP | Type | County | Population |
|---|---|---|---|
| 54407 | standard | Portage | 1,350 |
Finding a ZIP+4 in Amherst Junction
Knowing which of these 1 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 Amherst Junction street almost always have different ZIP+4 codes even though they share all five leading digits.
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