ZIP code 21705
Where is ZIP code 21705?
Frederick, Maryland
Frederick County · PO Box only ZIP code
ZIP code 21705 belongs to Frederick, Maryland in Frederick County. 21705 is a PO Box only ZIP code: it is used for post office boxes at the Frederick post office, not for street addresses. It is in the Eastern Time zone and uses area codes 227, 240 and 301. About 6 people live in the 21705 area. The closest ZIP codes are 21709 (Frederick, 4 mi north), 21703 (Frederick, 4.4 mi southwest) and 21701 (Frederick, 4.6 mi northeast).
| ZIP code | 21705 |
|---|---|
| Type | PO Box only (no street delivery) |
| Status | Active |
| City | Frederick |
| State | Maryland (MD) |
| County | Frederick County |
| Time zone | Eastern Time · now |
| Area codes | 227, 240, 301 |
| Coordinates | 39.4143, -77.4105 map |
| 3-digit prefix | 217 |
Population and income in 21705
| Population | 6 · lower than 100% of Maryland ZIP codes |
|---|---|
| People per square mile | 250 · lower than 60% of Maryland ZIP codes |
| Median age | 73.5 years · higher than 100% of Maryland ZIP codes |
| Men / women | 17% / 83% |
| Income per person | $4,400 |
| Below the poverty line | 100% |
| Bachelor’s degree or higher | 0.0% of adults 25+ |
| Housing units | 0 |
| Households | 0 |
| Land area | 0.02 sq mi |
Source: U.S. Census Bureau, American Community Survey 5-year estimates (2020–2024) for ZIP Code Tabulation Area 21705. Census ZIP areas are close to, but not exactly the same as, USPS delivery areas.
ZIP codes near 21705
| ZIP code | City | Distance | Type |
|---|---|---|---|
| 21709 | Frederick, MD | 4 mi N | Unique |
| 21703 | Frederick, MD | 4.4 mi SW | Standard |
| 21701 | Frederick, MD | 4.6 mi NE | Standard |
| 21704 | Frederick, MD | 5 mi S | Standard |
| 21714 | Braddock Heights, MD | 5.1 mi W | PO Box only |
| 21793 | Walkersville, MD | 5.5 mi NE | Standard |
| 21717 | Buckeystown, MD | 5.8 mi S | PO Box only |
| 21702 | Frederick, MD | 6 mi NW | Standard |
| 21774 | New Market, MD | 7.2 mi E | Standard |
| 21769 | Middletown, MD | 7.7 mi W | Standard |
| 21755 | Jefferson, MD | 7.9 mi SW | Standard |
| 21754 | Ijamsville, MD | 8.6 mi SE | Standard |
Straight-line distance between ZIP code center points. Find every ZIP code within 10 miles of 21705 or measure the distance to another ZIP code.
How to address mail to 21705
PO BOX 123
FREDERICK MD 21705
Put the city, the two-letter state code and the ZIP code on the last line. Adding the 4-digit ZIP+4 code (21705-XXXX) helps mail sort faster but isn’t required.
Other ZIP codes in Frederick, MD
All Frederick ZIP codes with population and income →
Questions
- What city is ZIP code 21705?
- 21705 is a Frederick, Maryland ZIP code.
- What county is 21705 in?
- ZIP code 21705 is in Frederick County, Maryland.
- What time zone is ZIP code 21705 in?
- 21705 is in the Eastern Time zone (America/New_York).
- What area code is 21705?
- Phone numbers in ZIP code 21705 use area codes 227, 240 and 301.
- What is the population of ZIP code 21705?
- About 6 people live in ZIP code 21705, according to the Census Bureau’s American Community Survey (2020–2024).
- Can I use 21705 for a street address?
- No. 21705 is only for PO Boxes. Street addresses in Frederick use 21701, 21702, 21703.
- What ZIP codes are near 21705?
- The nearest ZIP codes to 21705 are 21709 (Frederick, 4 miles), 21703 (Frederick, 4.4 miles), 21701 (Frederick, 4.6 miles) and 21704 (Frederick, 5 miles).