ZIP codes in Clay County
27 ZIPs touch Clay County, Missouri. The blue dashed line is the county border; orange ZIPs reach into it.
27
ZIP codes
10
cross the county line
308,409
people in these ZIPs
115
counties in MO
Most people
Clay County ZIP list
More counties in Missouri
- Carter County5
- Cass County18
- Cedar County10
- Chariton County12
- Christian County22
- Clark County10
- Clinton County11
- Cole County10
- Cooper County14
- Crawford County13
- Dade County13
- Dallas County13
Questions people actually ask
How many ZIP codes are in Clay County, Missouri?
27 ZIP codes reach into Clay County, including 4 PO Box or single-address ZIPs placed by the town they serve. 10 of them are only partly in the county and also cover a neighboring county.
Which ZIP code in Clay County has the most people?
64118 (Kansas City) has about 41,984 residents, the most of any ZIP touching Clay County, in the Census Bureau’s ACS 2020–2024 estimates.
Can a ZIP code be in Clay 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 Clay 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