ZIP code 21791
Where is ZIP code 21791?
Union Bridge, Maryland
Carroll County · Standard ZIP code
ZIP code 21791 belongs to Union Bridge, Maryland in Carroll County. 21791 is a standard ZIP code, so it covers street addresses as well as PO Boxes. It is in the Eastern Time zone and uses area codes 227, 240, 301, 410, 443 and 667. About 5,340 people live in the 21791 area, where the median household income is $93,015. The closest ZIP codes are 21776 (New Windsor, 4.7 mi south), 21158 (Westminster, 5.8 mi east) and 21787 (Taneytown, 6.3 mi north).
| ZIP code | 21791 |
|---|---|
| Type | Standard ZIP code for street addresses and PO Boxes |
| Status | Active |
| City | Union Bridge |
| Also accepted | Linwood |
| State | Maryland (MD) |
| County | Carroll County |
| Time zone | Eastern Time · now |
| Area codes | 227, 240, 301, 410, 443, 667 |
| Coordinates | 39.5799, -77.1319 map |
| 3-digit prefix | 217 |
Population and income in 21791
| Population | 5,340 · higher than 50% of Maryland ZIP codes |
|---|---|
| People per square mile | 116 · lower than 74% of Maryland ZIP codes |
| Median age | 37.7 years · lower than 74% of Maryland ZIP codes |
| Men / women | 51% / 49% |
| Median household income | $93,015 · lower than 59% of Maryland ZIP codes |
| Income per person | $41,286 |
| Below the poverty line | 5.1% |
| Bachelor’s degree or higher | 27% of adults 25+ |
| Median home value | $379,800 · lower than 60% of Maryland ZIP codes |
| Median rent | $1,457 a month |
| Housing units | 2,059 |
| Households | 1,968 (2.71 people on average) |
| Owners / renters | 82% / 18% |
| Land area | 46.04 sq mi (plus 0.08 sq mi of water) |
Source: U.S. Census Bureau, American Community Survey 5-year estimates (2020–2024) for ZIP Code Tabulation Area 21791. Census ZIP areas are close to, but not exactly the same as, USPS delivery areas.
ZIP codes near 21791
| ZIP code | City | Distance | Type |
|---|---|---|---|
| 21776 | New Windsor, MD | 4.7 mi S | Standard |
| 21158 | Westminster, MD | 5.8 mi E | Standard |
| 21787 | Taneytown, MD | 6.3 mi N | Standard |
| 21792 | Unionville, MD | 7.8 mi S | PO Box only |
| 21757 | Keymar, MD | 8 mi W | Standard |
| 21157 | Westminster, MD | 8.1 mi E | Standard |
| 21759 | Ladiesburg, MD | 8.5 mi W | PO Box only |
| 21775 | New Midway, MD | 8.7 mi W | PO Box only |
| 21762 | Libertytown, MD | 9.1 mi SW | PO Box only |
| 21798 | Woodsboro, MD | 9.4 mi W | Standard |
| 21778 | Rocky Ridge, MD | 10.7 mi W | Standard |
| 17340 | Littlestown, PA | 11.8 mi N | Standard |
Straight-line distance between ZIP code center points. Find every ZIP code within 10 miles of 21791 or measure the distance to another ZIP code.
How to address mail to 21791
123 MAIN ST
UNION BRIDGE MD 21791
Put the city, the two-letter state code and the ZIP code on the last line. USPS also accepts LINWOOD as the city name for 21791. Adding the 4-digit ZIP+4 code (21791-XXXX) helps mail sort faster but isn’t required.
Questions
- What city is ZIP code 21791?
- 21791 is a Union Bridge, Maryland ZIP code. Linwood is also accepted as the city name.
- What county is 21791 in?
- ZIP code 21791 is in Carroll County, Maryland.
- What time zone is ZIP code 21791 in?
- 21791 is in the Eastern Time zone (America/New_York).
- What area code is 21791?
- Phone numbers in ZIP code 21791 use area codes 227, 240, 301, 410, 443 and 667.
- What is the population of ZIP code 21791?
- About 5,340 people live in ZIP code 21791, according to the Census Bureau’s American Community Survey (2020–2024).
- What is the median income in 21791?
- The median household income in 21791 is $93,015 a year, lower than 59% of Maryland ZIP codes.
- What ZIP codes are near 21791?
- The nearest ZIP codes to 21791 are 21776 (New Windsor, 4.7 miles), 21158 (Westminster, 5.8 miles), 21787 (Taneytown, 6.3 miles) and 21792 (Unionville, 7.8 miles).