21705
ZIP 21705 is in Frederick, Maryland, in Frederick County; area codes 240, 301 and 227; Eastern time. Frederick has 6 ZIP codes; the others are 21701, 21702, 21703, 21704 and 21709.
- Type
- Standard
- Time zone
- America/New_York
- County
- Frederick
- Metro area
- Washington-Arlington-Alexandria, DC-VA-MD-WV
- Population
- 6
- Coordinates
- 39.4089, -77.4100
Weather right now
Asking the National Weather Service…
Where 21705 is
Approximate ZIP boundary (Census ZCTA 2020). ZIP codes are mail routes, not areas, so the shape shown is the Census tabulation area that approximates it.
- 🔢 Type 21705 into a pocket calculator and turn it upside down: SOLIZ — not quite a word, sorry.
- ➕ As a number, 21,705 = 3 × 5 × 1447. Its digits add up to 15, a total 1,657 other ZIP codes share.
- 💾In binary, the way a computer stores it:
101010011001001 - 🏠 Its numerical neighbours: 21704 (Frederick, MD, 4 mi away) and 21709 (Frederick, MD, 4 mi away).
- 🔄 Backwards, 21705 becomes 50712, which is not a ZIP code at all.
- 👥 65 other ZIP codes are made of exactly the same digits (01257, 01527, 01752, 02571, 02715, 07512, …). The farthest-flung twin is 75102 in Barry, TX, 1,188 miles away.
- 🧭 Farther north than 52% of all ZIP codes, and farther east than 80%.
- 🎯1,124 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 21705 and you would come out at 39.41°S, 102.59°E — 904 miles from Perth, Australia, the nearest big city to that spot.
- ☀Longest day of the year: 14h 57m of daylight. Shortest: 9h 23m.
- 📏 At 0.024 square miles of land, 21705 is bigger than 0% of ZIP codes — about 12 football fields.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 6This ZIP6 |
|---|---|
| Households | 0 |
| Housing units | 0 |
| Median age | 73.5This ZIP73.5Maryland39.4US 38.9 |
| Bachelor's degree or higher | 0.0% |
| Population density | 250.0 / sq miThis ZIP250.0 / sq mi |
Business and tax activity
| Business establishments | 18This ZIP18 |
|---|---|
| Employees | 333This ZIP333 |
| Annual payroll | $21,893,000This ZIP$21,893,000 |
Land area
| Land area | 0.02 sq miThis ZIP0.02 sq mi |
|---|---|
| Water area | 0.00 sq mi |
Other place names in 21705
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 21705
| ZIP | City | Distance |
|---|---|---|
21704 | Frederick, MD | 4.2 mi |
21709 | Frederick, MD | 4.3 mi |
21703 | Frederick, MD | 4.5 mi |
21701 | Frederick, MD | 4.8 mi |
21717 | Buckeystown, MD | 5.0 mi |
21702 | Frederick, MD | 5.2 mi |
21714 | Braddock Heights, MD | 5.3 mi |
21793 | Walkersville, MD | 6.6 mi |
21710 | Adamstown, MD | 7.1 mi |
21774 | New Market, MD | 7.3 mi |
Find every ZIP code within 10 miles of 21705 →
Questions about this ZIP code
Where is ZIP code 21705?
21705 is in Frederick, Maryland, in Frederick County, part of the Washington-Arlington-Alexandria, DC-VA-MD-WV metropolitan area. Its published point location is 39.4089, -77.4100.
What county is 21705 in?
21705 lies in Frederick County.
What area code is 21705?
Frederick uses area codes 240, 301 and 227, from NANPA's telephone records.
What time zone is 21705 in?
21705 uses America/New_York.
How many people live in 21705?
About 6 people live in ZIP code 21705, at 250.0 people per square mile. These are American Community Survey 5-year estimates for the ZIP Code Tabulation Area, not a headcount.
What ZIP codes are near 21705?
The closest are 21704 (4.2 mi), 21709 (4.3 mi), 21703 (4.5 mi), 21701 (4.8 mi) and 21717 (5 mi).
Is 21705 a PO Box ZIP code?
21705 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “21705 ZIP Code — Frederick, Maryland (Frederick County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21705
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/21705.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.