Caroline County, MD ZIP Codes
9 ZIP codes cover all or part of Caroline County, Maryland. The Census Bureau counts 33,669 residents in the county, with a median household income of $68,457 and a median home value of $290,100. Median household income ranges from $53,558 in 21640 to $90,385 in 21655. Its largest communities include Denton, Federalsburg, Greensboro, Ridgely and Preston.
Caroline County (Census county figures)
| Measure | Census figure |
|---|---|
| Residents | 33,669 |
| Households | 12,495 |
| Median household income | $68,457 |
| Median home value | $290,100 |
| Median age | 39.9 |
| Median rent | $1,105 |
All 9 ZIP codes together
| Measure | Value |
|---|---|
| Residents (sum of ZIP codes) | 34,832 |
| Households (sum of ZIP codes) | 12,941 |
| Median household income, range across ZIP codes | $53,558 (21640) to $90,385 (21655) |
| Household-weighted average of ZIP medians (an approximation, not a true median) | $71,892 |
| Homeowners | 72.6% |
| Households with kids under 18 | 31.7% |
| Moved in the past year | 9.1% |
| Carrier routes in EDDM2GO's route library | 27 routes, 13,581 homes (8 of 9 ZIP codes) |
Top facts
- Highest median household income in Caroline County: 21655 ($90,385)
- Most residents: 21629 (10,252 people)
- Highest homeownership: 21640 (92.4% own their home)
- Most households with kids: 21636 (37.7% of households)
- Most new movers: 21629 (14.9% moved in last year)
- Youngest median age: 21660 (35.6 years)
- Highest median home value: 21660 ($359,300)
Every ZIP code in Caroline County
| ZIP | Mailing city | Residents | Households | Median income | Home value | Homeowners | With kids | New movers | Carrier routes | Mailboxes | Why listed |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 21629 | Denton | 10,252 | 3,688 | $73,956 | $334,200 | 66.4% | 31.8% | 14.9% | 8 | 4,285 | 100% of its land |
| 21632 | Federalsburg | 6,436 | 2,656 | $61,316 | $216,000 | 63.1% | 28.0% | 2.5% | 6 | 2,904 | 80% of its land |
| 21655 | Preston | 5,053 | 1,862 | $90,385 | $289,200 | 84.0% | 31.7% | 5.8% | 3 | 2,001 | 100% of its land |
| 21639 | Greensboro | 4,682 | 1,743 | $62,772 | $269,400 | 72.2% | 36.5% | 8.2% | 3 | 1,833 | 100% of its land |
| 21660 | Ridgely | 4,132 | 1,457 | $80,469 | $359,300 | 77.1% | 30.8% | 9.6% | 3 | 1,591 | 100% of its land |
| 21649 | Marydel | 1,890 | 546 | $68,542 | $222,700 | 83.2% | 35.9% | 9.5% | 1 | 583 | 48% of its land |
| 21640 | Henderson | 1,163 | 511 | $53,558 | $268,500 | 92.4% | 29.5% | 12.2% | 2 | 610 | 80% of its land |
| 21636 | Goldsboro | 1,097 | 422 | $73,426 | $320,000 | 86.3% | 37.7% | 5.3% | 1 | 447 | 100% of its land |
| 21641 | Hillsboro | 127 | 56 | $66,875 | $254,200 | 69.6% | 16.1% | 18.4% | — | — | 100% of its land |
A ZIP code is listed for Caroline County when at least 10% of its land is in the county, when it holds at least 10% of the county's land, or when the county is its main county. Totals add up whole ZIP codes, including parts that cross the county line; the Census county figures above do not.
Cities and communities
- Denton — 4,936 residents · 1 ZIP code
- Federalsburg — 2,837 residents · 1 ZIP code
- Greensboro — 2,634 residents · 1 ZIP code
- Ridgely — 1,772 residents · 1 ZIP code
- Preston — 852 residents · 1 ZIP code
- Williston — 391 residents · 1 ZIP code
- Goldsboro — 248 residents · 1 ZIP code
- Choptank — 186 residents · 1 ZIP code
- Henderson — 132 residents · 2 ZIP codes
- Hillsboro — 127 residents · 1 ZIP code
- West Denton — 48 residents · 1 ZIP code
Rankings
- Richest ZIP codes in Caroline County — 8 ZIP codes ranked
- ZIP codes with the highest home values in Caroline County — 8 ZIP codes ranked
- ZIP codes with the highest homeownership in Caroline County — 8 ZIP codes ranked
- ZIP codes with the most families with kids in Caroline County — 8 ZIP codes ranked
- ZIP codes with the most new movers in Caroline County — 8 ZIP codes ranked
- Youngest ZIP codes in Caroline County — 8 ZIP codes ranked
- Oldest ZIP codes in Caroline County — 8 ZIP codes ranked
- Fastest-growing ZIP codes in Caroline County — 8 ZIP codes ranked
Price a mailing to Caroline County ZIP codes
EDDM guides
Pick carrier routes on the EDDM route map
Frequently asked questions
- What ZIP codes are in Caroline County, MD?
- 21629, 21632, 21655, 21639, 21660, 21649, 21640, 21636 and 21641. Some cross the county line; the table shows each ZIP's share of land in the county.
- What is the population of Caroline County?
- 33,669 residents in 12,495 households (ACS 5-year estimates, 2020–2024).
- What is the median household income in Caroline County?
- $68,457 for the county as a whole. Its ZIP codes range from $53,558 (21640) to $90,385 (21655).
- Which Caroline County ZIP code has the highest median household income?
- 21655, at $90,385, among ZIP codes with at least 1,000 residents. See the full ranking of Caroline County ZIP codes by income.
- How many carrier routes and mailboxes are in Caroline County?
- For the 8 of 9 ZIP codes in EDDM2GO's stored route library: 27 carrier routes reaching 13,581 residential and 671 business mailboxes. The route map loads the rest when you search them.
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.