County ZIP codes · Maryland · FIPS 24011
Caroline County, MD ZIP Codes
Caroline County, Maryland has 12 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 10 residential and 2 for PO boxes or a single organization. 8 of the residential ones lie mainly in Caroline County and 2 mainly in a neighboring county; 4 cross the county line. Median household income ranges from $53,558 in 21640 (Henderson) to $104,940 in 21657 (Queen Anne) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Caroline County?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
How different are its ZIP codes?
The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $61,316 and $80,469.
They carry 10 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 10 residential ZIP codes in Caroline County
8 ZIP codes lie mainly in Caroline County; 2 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 21629 | Denton | 10,252 | 123 | $74k | $334k | 100% |
| 21632 | Federalsburg | 6,436 | 83 | $61k | $216k | 80% |
| 21655 | Preston | 5,053 | 96 | $90k | $289k | 100% |
| 21639 | Greensboro | 4,682 | 142 | $63k | $269k | 100% |
| 21660 | Ridgely | 4,132 | 127 | $81k | $359k | 100% |
| 21640 | Henderson | 1,163 | 45 | $54k | $269k | 80% |
| 21636 | Goldsboro | 1,097 | 47 | $73k | $320k | 100% |
| 21641 | Hillsboro | 127 | 941 | $67k | $254k | 100% |
Partly in Caroline County
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).
Which ZIP codes cross the county line?
4 ZIP codes of Caroline County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Caroline | Elsewhere |
|---|---|---|
| 21632 | 80% | Dorchester County20% |
| 21649 | 48% | Queen Anne's County52% |
| 21657 | 3% | Queen Anne's County77%; Talbot County20% |
| 21640 | 80% | Queen Anne's County20% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
| ZIP | Postal name |
|---|---|
| 21609 | Bethlehem |
| 21670 | Templeville |
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Caroline County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Every ZIP code of Caroline County starts with 216.
| Prefix | Sectional center | Here | All codes |
|---|---|---|---|
| 216 | Eastern Shore, MD (SCF 216) | 12 | 62 |
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.