ZIP Codes in Mount Pleasant, MI
Mount Pleasant uses 2 ZIP codes, all in Isabella County. Pick one below for details, or look up the full nine-digit ZIP+4 for a specific street address.
All 2 Mount Pleasant ZIP codes
| ZIP | Type | County | Population |
|---|---|---|---|
| 48858 | standard | Isabella | 42,226 |
| 48859 | standard | Isabella | 2,228 |
Finding a ZIP+4 in Mount Pleasant
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 Mount Pleasant street almost always have different ZIP+4 codes even though they share all five leading digits.
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