ZIP Codes in Ballwin, MO
Ballwin uses 2 ZIP codes, all in St. Louis County. Pick one below for details, or look up the full nine-digit ZIP+4 for a specific street address.
All 2 Ballwin ZIP codes
| ZIP | Type | County | Population |
|---|---|---|---|
| 63011 | standard | St. Louis | 35,920 |
| 63021 | standard | St. Louis | 55,666 |
Finding a ZIP+4 in Ballwin
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 Ballwin street almost always have different ZIP+4 codes even though they share all five leading digits.
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