ZIP code 21758
Where is ZIP code 21758?
Knoxville, Maryland
Frederick County · Standard ZIP code
ZIP code 21758 belongs to Knoxville, Maryland in Frederick County. 21758 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, 304, 540, 681 and 826. About 4,409 people live in the 21758 area, where the median household income is $111,528. The closest ZIP codes are 21716 (Brunswick, 2.7 mi southeast), 21715 (Brownsville, 2.7 mi north) and 21718 (Burkittsville, 3.3 mi northeast).
| ZIP code | 21758 |
|---|---|
| Type | Standard ZIP code for street addresses and PO Boxes |
| Status | Active |
| City | Knoxville |
| Also accepted | Brunswick |
| State | Maryland (MD) |
| County | Frederick County |
| Time zone | Eastern Time · now |
| Area codes | 227, 240, 301, 304, 540, 681, 826 |
| Coordinates | 39.3479, -77.6513 map |
| 3-digit prefix | 217 |
Population and income in 21758
| Population | 4,409 · lower than 53% of Maryland ZIP codes |
|---|---|
| People per square mile | 138 · lower than 71% of Maryland ZIP codes |
| Median age | 39 years · lower than 66% of Maryland ZIP codes |
| Men / women | 52% / 49% |
| Median household income | $111,528 · higher than 54% of Maryland ZIP codes |
| Income per person | $50,488 |
| Below the poverty line | 5.9% |
| Bachelor’s degree or higher | 44% of adults 25+ |
| Median home value | $424,600 · higher than 51% of Maryland ZIP codes |
| Median rent | $1,770 a month |
| Housing units | 1,626 |
| Households | 1,588 (2.78 people on average) |
| Owners / renters | 84% / 16% |
| Land area | 32.02 sq mi (plus 2.83 sq mi of water) |
Source: U.S. Census Bureau, American Community Survey 5-year estimates (2020–2024) for ZIP Code Tabulation Area 21758. Census ZIP areas are close to, but not exactly the same as, USPS delivery areas.
ZIP codes near 21758
| ZIP code | City | Distance | Type |
|---|---|---|---|
| 21716 | Brunswick, MD | 2.7 mi SE | Standard |
| 21715 | Brownsville, MD | 2.7 mi N | PO Box only |
| 21718 | Burkittsville, MD | 3.3 mi NE | Standard |
| 21755 | Jefferson, MD | 5.9 mi E | Standard |
| 21779 | Rohrersville, MD | 6.6 mi N | Standard |
| 25425 | Harpers Ferry, WV | 6.7 mi W | Standard |
| 21756 | Keedysville, MD | 7.8 mi N | Standard |
| 21777 | Point Of Rocks, MD | 7.9 mi SE | Standard |
| 25432 | Millville, WV | 8.1 mi SW | Standard |
| 25423 | Halltown, WV | 8.2 mi W | PO Box only |
| 21782 | Sharpsburg, MD | 8.4 mi NW | Standard |
| 21769 | Middletown, MD | 8.4 mi NE | Standard |
Straight-line distance between ZIP code center points. Find every ZIP code within 10 miles of 21758 or measure the distance to another ZIP code.
How to address mail to 21758
123 MAIN ST
KNOXVILLE MD 21758
Put the city, the two-letter state code and the ZIP code on the last line. USPS also accepts BRUNSWICK as the city name for 21758. Adding the 4-digit ZIP+4 code (21758-XXXX) helps mail sort faster but isn’t required.
Questions
- What city is ZIP code 21758?
- 21758 is a Knoxville, Maryland ZIP code. Brunswick is also accepted as the city name.
- What county is 21758 in?
- ZIP code 21758 is in Frederick County, Maryland.
- What time zone is ZIP code 21758 in?
- 21758 is in the Eastern Time zone (America/New_York).
- What area code is 21758?
- Phone numbers in ZIP code 21758 use area codes 227, 240, 301, 304, 540, 681 and 826.
- What is the population of ZIP code 21758?
- About 4,409 people live in ZIP code 21758, according to the Census Bureau’s American Community Survey (2020–2024).
- What is the median income in 21758?
- The median household income in 21758 is $111,528 a year, higher than 54% of Maryland ZIP codes.
- What ZIP codes are near 21758?
- The nearest ZIP codes to 21758 are 21716 (Brunswick, 2.7 miles), 21715 (Brownsville, 2.7 miles), 21718 (Burkittsville, 3.3 miles) and 21755 (Jefferson, 5.9 miles).