ZIP codes in St. Louis city
49 ZIPs touch St. Louis city, Missouri. The blue dashed line is the county border; orange ZIPs reach into it.
49
ZIP codes
12
cross the county line
547,884
people in these ZIPs
115
counties in MO
Most people
St. Louis city ZIP list
More counties in Missouri
- Shannon County10
- Shelby County9
- St. Charles County18
- St. Clair County16
- St. Francois County16
- St. Louis County56
- Ste. Genevieve County8
- Stoddard County14
- Stone County18
- Sullivan County13
- Taney County22
- Texas County21
Questions people actually ask
How many ZIP codes are in St. Louis city, Missouri?
49 ZIP codes reach into St. Louis city, including 19 PO Box or single-address ZIPs placed by the town they serve. 12 of them are only partly in the county and also cover a neighboring county.
Which ZIP code in St. Louis city has the most people?
63123 (Saint Louis) has about 49,077 residents, the most of any ZIP touching St. Louis city, in the Census Bureau’s ACS 2020–2024 estimates.
Can a ZIP code be in St. Louis city and another county?
Yes. ZIP codes follow mail routes, not county lines. Rows marked with a percentage show how much of that ZIP’s land is in St. Louis city. For one address, pin the exact spot on the ZIP finder to see its county.
Where does this list come from?
ZIP areas and their county overlaps come from the Census Bureau’s 2020 ZIP Code Tabulation Area to county relationship file. PO Box ZIPs have no area, so each is placed in the county of the ZIP area nearest the town it serves.
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Updated 2026-11-10 · Where the data comes from