| ZIP Codes: | 12 ZIP Codes (11 Standard, 1 PO Box, 0 Unique) [See All] |
| Area Codes: | 410 / 443 / 667 |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 2:12:28 PM |
| Population: | 169,714 [See All] |
| FIPS: | 24013 |
| CBSA: | Baltimore-Columbia-Towson, MD |
| Land Area: | 515 sq mi |
| Water Area: | 7 sq mi |
| Coordinates: | 39.5575, -77.0082 |
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169,714 residents live across 12 ZIPs covering 515 sq mi, served by 11 distinct USPS-recognized cities.
Population moved from 163,077 to 169,714 from 2014 to 2024 — a +4.1% change. 8 ZIPs gained residents, 3 lost.
The county's wealthiest ZIP 21104 (Marriottsville, $191,804 median) and poorest ZIP 21787 (Taneytown, $91,682) are 25.6 miles apart — a 2.1× income gap across local geography.
Median home values vary 1.9× across this county — from $355,000 in 21787 (Taneytown) to $680,200 in 21104 (Marriottsville).
Density varies 9× across the county — from 76 people/sq mi in 21757 (Keymar) to 669 in 21784 (Sykesville).
Educational attainment ranges from 22.2% bachelor's+ in 21787 (Taneytown) to 64.4% in 21104 (Marriottsville) — the breadth of educational profiles across the area.
Within Maryland, this is the #10 most populous of 24 counties and ranks #8 for median household income .
On the national stage, Carroll County is ranks #84 for income .
Weighted by population, the typical household earns about $120,483 across the county — reflecting what a typical resident sees, not a simple ZIP average.
40.7% of adults age 25+ hold a bachelor's degree or higher (48,201 of 118,513 reporting).
11 Standard delivery, 1 PO Box only, 0 single-entity Unique ZIPs serve this county.
1 ZIP in this county where more than 60% of adults 25+ hold a bachelor's degree — typically college campuses, research enclaves, or tech corridors.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 21784 | Sykesville | Standard | 39,258 | $139,395 | 58.7 | -1.1% |
| 21157 | Westminster | Standard | 38,984 | $104,966 | 77.2 | 5.1% |
| 21158 | Westminster | Standard | 22,083 | $109,827 | 76.6 | 9.8% |
| 21074 | Hampstead | Standard | 14,777 | $108,536 | 39.1 | 1.2% |
| 21102 | Manchester | Standard | 12,162 | $135,069 | 41.5 | 11.8% |
| 21787 | Taneytown | Standard | 11,645 | $91,682 | 57.6 | 1.0% |
| 21048 | Finksburg | Standard | 10,481 | $131,921 | 28.1 | 1.1% |
| 21776 | New Windsor | Standard | 6,261 | $133,409 | 35.9 | 19.2% |
| 21104 | Marriottsville | Standard | 6,052 | $191,804 | 17.6 | 22.4% |
| 21791 | Union Bridge | Standard | 5,340 | $93,015 | 47.2 | -5.4% |
| 21757 | Keymar | Standard | 2,671 | $100,500 | 35.1 | -9.8% |
| 21088 | Lineboro | PO Box | — | — | 0.0 | — |