ZIP codes in St. Francois County
16 ZIPs touch St. Francois County, Missouri. The blue dashed line is the county border; orange ZIPs reach into it.
16
ZIP codes
12
cross the county line
139,756
people in these ZIPs
115
counties in MO
Most people
St. Francois County ZIP list
More counties in Missouri
- Scotland County9
- Scott County14
- Shannon County10
- Shelby County9
- St. Charles County18
- St. Clair County16
- St. Louis County56
- St. Louis city49
- Ste. Genevieve County8
- Stoddard County14
- Stone County18
- Sullivan County13
Questions people actually ask
How many ZIP codes are in St. Francois County, Missouri?
16 ZIP codes reach into St. Francois County, including 1 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. Francois County has the most people?
63640 (Farmington) has about 29,263 residents, the most of any ZIP touching St. Francois County, in the Census Bureau’s ACS 2020–2024 estimates.
Can a ZIP code be in St. Francois County 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. Francois County. 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