ZIP codes in Caroline County
11 ZIPs touch Caroline County, Maryland. The blue dashed line is the county border; orange ZIPs reach into it.
11
ZIP codes
4
cross the county line
36,186
people in these ZIPs
24
counties in MD
Most people
Caroline County ZIP list
More counties in Maryland
- Allegany County22
- Anne Arundel County48
- Baltimore County66
- Baltimore city50
- Calvert County15
- Carroll County16
- Cecil County17
- Charles County28
- Dorchester County18
- Frederick County39
- Garrett County13
Questions people actually ask
How many ZIP codes are in Caroline County, Maryland?
11 ZIP codes reach into Caroline County, including 1 PO Box or single-address ZIPs placed by the town they serve. 4 of them are only partly in the county and also cover a neighboring county.
Which ZIP code in Caroline County has the most people?
21629 (Denton) has about 10,252 residents, the most of any ZIP touching Caroline County, in the Census Bureau’s ACS 2020–2024 estimates.
Can a ZIP code be in Caroline 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 Caroline 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