St. Louis County, located in the state of Missouri, contains a range of ZIP codes that are essential for mail delivery, demographics, mapping, and regional planning. Below is a complete list of ZIP codes associated with this county.

These ZIP codes help identify specific areas and communities within the county, ranging from small towns and villages to broader rural stretches. Whether you’re moving to St. Louis County, setting up a business, or analyzing demographic trends, understanding ZIP code distribution is an essential part of the process.

Zip code
63074
63105
63034
63044
63043
63119
63122
63088
63131
63144
63032
63145
63123
63136
63137
63124
63038
63040
63114
63132
63146
63129
63134
63151
63005
63017
63024
63031
63120
63143
63125
63128
63026
63049
63127
63135
63171
63033
63069
63130
63133
63138
63011
63006
63042
63141
63140
63021
63117
63121
63126
63025
63022
63045
63167

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St. Louis County Information

Use this tool to find your area details by using zip code.

ZIP Code to County

Note: Some ZIP codes may span across county borders and may be listed under more than one county. This is common in rural or low-population areas where ZIP code regions are broader.

Source: Data compiled from official county records, USPS ZIP code data, and the United States Census Bureau.

Frequently Asked Questions

How many ZIP codes are in St. Louis County County?

There are approximately 55 ZIP codes in this county. Check the table above for the complete list.

Do ZIP codes in St. Louis County overlap with other counties?

Yes, some ZIP codes may span more than one county. This is especially common in less populated or rural areas.