Carroll County, Maryland ZIP codes
10 ZIP codes are in Carroll County, plus 6 that cross in from neighboring counties. It's part of the Baltimore-Columbia-Towson, MD metro area.
- ZIP codes
- 10
- Population in these ZIPs
- 158,322
- Avg. median income
- $118,700population-weighted
- Cities & towns
- 9
Click anywhere on the map to see which ZIP code it's in.
ZIP codes in Carroll County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 21048 | Finksburg | 10,481 | $131,921 | $555,700 |
| 21074 | Hampstead | 14,777 | $108,536 | $431,900 |
| 21088 PO Box | Lineboro | — | — | — |
| 21102 | Manchester | 12,162 | $135,069 | $461,200 |
| 21157 | Westminster | 38,984 | $104,966 | $460,900 |
| 21158 | Westminster | 22,083 | $109,827 | $466,600 |
| 21757 | Keymar | 2,671 | $100,500 | $454,300 |
| 21776 | New Windsor | 6,261 | $133,409 | $481,500 |
| 21784 | Sykesville | 39,258 | $139,395 | $553,000 |
| 21787 | Taneytown | 11,645 | $91,682 | $395,600 |
ZIP codes partly in Carroll County
These ZIP codes are mostly in a neighboring county but cover part of Carroll County.
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 21104 | Marriottsville | Howard County | 6,052 | $191,804 | $716,400 |
| 21136 | Reisterstown | Baltimore County | 32,088 | $118,500 | $407,100 |
| 21155 | Upperco | Baltimore County | 3,313 | $123,158 | $536,700 |
| 21771 | Mount Airy | Frederick County | 33,031 | $157,302 | $625,900 |
| 21791 | Union Bridge | Frederick County | 5,340 | $93,015 | $444,900 |
| 21797 | Woodbine | Howard County | 8,643 | $189,241 | $800,300 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities and towns in Carroll County
Nearby counties
Frequently asked questions
How many ZIP codes are in Carroll County, Maryland?
10 ZIP codes are mainly in Carroll County, and 6 more ZIP codes from neighboring areas reach partly into it.
What cities are in Carroll County?
ZIP codes in Carroll County use the city names Finksburg, Hampstead, Keymar, Lineboro, Manchester, New Windsor, Sykesville, Taneytown and Westminster.
What metro area is Carroll County in?
Carroll County is part of the Baltimore-Columbia-Towson, MD metropolitan statistical area.