ZIP codes in St. Charles County
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- 63301 St. CharlesSt. Charles County
- 63303 Saint CharlesSt. Charles County
- 63304 Saint CharlesSt. Charles County
- 63332 AugustaSt. Charles County
- 63341 DefianceSt. Charles County
- 63348 ForistellSt. Charles County
- 63365 New MelleSt. Charles County
- 63366 O'FallonSt. Charles County
- 63367 Lake St. LouisSt. Charles County
- 63368 O'FallonSt. Charles County
- 63373 Portage Des SiouxSt. Charles County
- 63376 St. PetersSt. Charles County
- 63385 WentzvilleSt. Charles County
- 63386 Portage Des SiouxSt. Charles County