ZIP codes in Buchanan County
17 ZIPs touch Buchanan County, Missouri. The blue dashed line is the county border; orange ZIPs reach into it.
17
ZIP codes
9
cross the county line
95,488
people in these ZIPs
115
counties in MO
Most people
Buchanan County ZIP list
More counties in Missouri
- Barry County18
- Barton County8
- Bates County13
- Benton County13
- Bollinger County14
- Boone County20
- Butler County13
- Caldwell County10
- Callaway County27
- Camden County18
- Cape Girardeau County22
- Carroll County11
Questions people actually ask
How many ZIP codes are in Buchanan County, Missouri?
17 ZIP codes reach into Buchanan County, including 2 PO Box or single-address ZIPs placed by the town they serve. 9 of them are only partly in the county and also cover a neighboring county.
Which ZIP code in Buchanan County has the most people?
64506 (Saint Joseph) has about 21,461 residents, the most of any ZIP touching Buchanan County, in the Census Bureau’s ACS 2020–2024 estimates.
Can a ZIP code be in Buchanan 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 Buchanan 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