21709

ZIP 21709 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 21705.

Type: No street area
Time zone: America/New_York
County: Frederick
Metro area: Washington-Arlington-Alexandria, DC-VA-MD-WV
Coordinates: 39.4700, -77.3921

The Census map gives this ZIP code no delivery area of its own, which usually means it serves post office boxes, a single organization or a post office rather than streets of homes.

This ZIP code has no Census tabulation area of its own. Its point falls inside ZCTA 21793, whose figures describe that area — not this ZIP code.

☼ Live from 21709 — Frederick, MD

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Where 21709 is

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This ZIP code has no Census tabulation area, so there is no boundary to draw — the marker is its published point location.

★ Weird and wonderful facts about 21709

🔢 Type 21709 into a pocket calculator and turn it upside down: GOLIZ — not quite a word, sorry.
➕ As a number, 21,709 = 17 × 1277. Its digits add up to 19, a total 2,454 other ZIP codes share.
💾In binary, the way a computer stores it: 101010011001101
🏠 Its numerical neighbours: 21705 (Frederick, MD, 4 mi away) and 21710 (Adamstown, MD, 11 mi away).
🔄 Backwards, 21709 becomes 90712 — and that is a real ZIP code: Lakewood, CA, 2,272 miles away.
👥 53 other ZIP codes are made of exactly the same digits (02719, 02791, 02917, 07192, 07921, 09172, …). The farthest-flung twin is 09721 in APO AE, a military post office, 4,284 miles away.
🧭 Farther north than 52% of all ZIP codes, and farther east than 80%.
🎯1,125 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
🌏 Dig straight through the Earth from 21709 and you would come out at 39.47°S, 102.61°E — 905 miles from Perth, Australia, the nearest big city to that spot.
☀Longest day of the year: 14h 57m of daylight. Shortest: 9h 23m.

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Source: USGS.

Land area

ZIP codes near 21709

ZIP	City	Distance
`21702`	Frederick, MD	2.8 mi
`21793`	Walkersville, MD	2.9 mi
`21701`	Frederick, MD	3.6 mi
`21705`	Frederick, MD	4.3 mi
`21798`	Woodsboro, MD	7.0 mi
`21714`	Braddock Heights, MD	7.5 mi
`21774`	New Market, MD	7.5 mi
`21762`	Libertytown, MD	7.7 mi
`21704`	Frederick, MD	8.0 mi
`21703`	Frederick, MD	8.3 mi

Find every ZIP code within 10 miles of 21709 →

Questions about this ZIP code

Where is ZIP code 21709?

21709 is in Frederick, Maryland, in Frederick County, part of the Washington-Arlington-Alexandria, DC-VA-MD-WV metropolitan area. Its published point location is 39.4700, -77.3921.

What county is 21709 in?

21709 lies in Frederick County.

What area code is 21709?

Frederick uses area codes 240, 301 and 227, from NANPA's telephone records.

What time zone is 21709 in?

21709 uses America/New_York.

What ZIP codes are near 21709?

The closest are 21702 (2.8 mi), 21793 (2.9 mi), 21701 (3.6 mi), 21705 (4.3 mi) and 21798 (7 mi).

Is 21709 a PO Box ZIP code?

Possibly. The Census map gives this ZIP code no delivery area of its own, which usually means it serves post office boxes, a single organization or a post office rather than streets of homes.

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Cite this page

zipcodes.pro. “21709 ZIP Code — Frederick, Maryland (Frederick County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21709

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/21709.json

Underlying data is public domain or openly licensed — sources, vintages and licences.