ZIP code 21757
Where is ZIP code 21757?
Keymar, Maryland
Frederick County · Standard ZIP code
ZIP code 21757 belongs to Keymar, Maryland in Frederick County. 21757 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 2,671 people live in the 21757 area, where the median household income is $100,500. The closest ZIP codes are 21759 (Ladiesburg, 0.5 mi northwest), 21775 (New Midway, 0.7 mi west) and 21798 (Woodsboro, 2.5 mi south).
| ZIP code | 21757 |
|---|---|
| Type | Standard ZIP code for street addresses and PO Boxes |
| Status | Active |
| City | Keymar |
| Also accepted | Detour, Middleburg |
| State | Maryland (MD) |
| County | Frederick County |
| Time zone | Eastern Time · now |
| Area codes | 227, 240, 301, 410, 443, 667 |
| Coordinates | 39.5656, -77.2817 map |
| 3-digit prefix | 217 |
Population and income in 21757
| Population | 2,671 · lower than 61% of Maryland ZIP codes |
|---|---|
| People per square mile | 76 · lower than 82% of Maryland ZIP codes |
| Median age | 37.8 years · lower than 74% of Maryland ZIP codes |
| Men / women | 55% / 45% |
| Median household income | $100,500 · lower than 54% of Maryland ZIP codes |
| Income per person | $46,390 |
| Below the poverty line | 1.7% |
| Bachelor’s degree or higher | 30% of adults 25+ |
| Median home value | $466,100 · higher than 63% of Maryland ZIP codes |
| Median rent | $1,408 a month |
| Housing units | 1,072 |
| Households | 1,018 (2.6 people on average) |
| Owners / renters | 82% / 18% |
| Land area | 35.17 sq mi (plus 0.09 sq mi of water) |
Source: U.S. Census Bureau, American Community Survey 5-year estimates (2020–2024) for ZIP Code Tabulation Area 21757. Census ZIP areas are close to, but not exactly the same as, USPS delivery areas.
ZIP codes near 21757
| ZIP code | City | Distance | Type |
|---|---|---|---|
| 21759 | Ladiesburg, MD | 0.5 mi NW | PO Box only |
| 21775 | New Midway, MD | 0.7 mi W | PO Box only |
| 21798 | Woodsboro, MD | 2.5 mi S | Standard |
| 21778 | Rocky Ridge, MD | 3.8 mi NW | Standard |
| 21762 | Libertytown, MD | 6.1 mi S | PO Box only |
| 21793 | Walkersville, MD | 7 mi SW | Standard |
| 21788 | Thurmont, MD | 7 mi NW | Standard |
| 21791 | Union Bridge, MD | 8 mi E | Standard |
| 21792 | Unionville, MD | 8.1 mi SE | PO Box only |
| 21701 | Frederick, MD | 8.7 mi S | Standard |
| 21709 | Frederick, MD | 8.8 mi SW | Unique |
| 21787 | Taneytown, MD | 9.2 mi NE | Standard |
Straight-line distance between ZIP code center points. Find every ZIP code within 10 miles of 21757 or measure the distance to another ZIP code.
How to address mail to 21757
123 MAIN ST
KEYMAR MD 21757
Put the city, the two-letter state code and the ZIP code on the last line. USPS also accepts DETOUR and MIDDLEBURG as the city name for 21757. Adding the 4-digit ZIP+4 code (21757-XXXX) helps mail sort faster but isn’t required.
Questions
- What city is ZIP code 21757?
- 21757 is a Keymar, Maryland ZIP code. Detour and Middleburg are also accepted as the city name.
- What county is 21757 in?
- ZIP code 21757 is in Frederick County, Maryland.
- What time zone is ZIP code 21757 in?
- 21757 is in the Eastern Time zone (America/New_York).
- What area code is 21757?
- Phone numbers in ZIP code 21757 use area codes 227, 240, 301, 410, 443 and 667.
- What is the population of ZIP code 21757?
- About 2,671 people live in ZIP code 21757, according to the Census Bureau’s American Community Survey (2020–2024).
- What is the median income in 21757?
- The median household income in 21757 is $100,500 a year, lower than 54% of Maryland ZIP codes.
- What ZIP codes are near 21757?
- The nearest ZIP codes to 21757 are 21759 (Ladiesburg, 0.5 miles), 21775 (New Midway, 0.7 miles), 21798 (Woodsboro, 2.5 miles) and 21778 (Rocky Ridge, 3.8 miles).