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ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — ZIP/21703

21703

ZIP 21703 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, 21704, 21705 and 21709.

Type
Standard
Time zone
America/New_York
County
Frederick
Population
41,960
Coordinates
39.3670, -77.4735
☼ Live from 21703 — Frederick, MD

Weather right now

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Local time: —

Where 21703 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.

★ Weird and wonderful facts about 21703
  • 🔢 Type 21703 into a pocket calculator and turn it upside down: EOLIZ — not quite a word, sorry.
  • ➕ As a number, 21,703 = 11 × 1973. Its digits add up to 13, a total 1,179 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 101010011000111
  • 🏠 Its numerical neighbours: 21702 (Frederick, MD, 8 mi away) and 21704 (Frederick, MD, 5 mi away).
  • 🔄 Backwards, 21703 becomes 30712, which is not a ZIP code at all.
  • 👥 63 other ZIP codes are made of exactly the same digits (01237, 02137, 02713, 03217, 10273, 12037, …). The farthest-flung twin is 73021 in Colony, OK, 1,194 miles away.
  • 🧭 Farther north than 51% of all ZIP codes, and farther east than 80%.
  • 🎯1,122 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 21703 and you would come out at 39.37°S, 102.53°E — 906 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 57m of daylight. Shortest: 9h 23m.
  • 📏 At 32.0 square miles of land, 21703 is bigger than 47% of ZIP codes — room for about 24 Central Parks.
🌙 The sky over 21703 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population41,960This ZIP41,960
Households15,517This ZIP15,517
Housing units16,069This ZIP16,069
Median age34.6This ZIP34.6Maryland39.4US 38.9
Median household income$106,334This ZIP$106,334Maryland$103,678US $80,734
Median home value$384,600This ZIP$384,600Maryland$419,900US $332,700
Median gross rent$1,991This ZIP$1,991Maryland$1,705US $1,413
Bachelor's degree or higher43.0%This ZIP43.0%
Mean commute33.5 minThis ZIP33.5 min
Population density1,310.0 / sq miThis ZIP1,310.0 / sq mi

Business and tax activity

Business establishments900This ZIP900
Employees18,318This ZIP18,318
Annual payroll$1,240,918,000This ZIP$1,240,918,000
Tax returns filed22,810This ZIP22,810
Total adjusted gross income$1,845,101,000This ZIP$1,845,101,000

Land area

Land area32.03 sq miThis ZIP32.03 sq mi
Water area0.04 sq miThis ZIP0.04 sq mi

Other place names in 21703

Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.

ZIP codes near 21703

ZIPCityDistance
21717 Buckeystown, MD 3.0 mi
21714 Braddock Heights, MD 3.6 mi
21705 Frederick, MD 4.5 mi
21710 Adamstown, MD 4.6 mi
21755 Jefferson, MD 5.1 mi
21704 Frederick, MD 5.3 mi
21777 Point Of Rocks, MD 6.7 mi
21769 Middletown, MD 7.3 mi
21790 Tuscarora, MD 7.4 mi
21702 Frederick, MD 7.9 mi

Find every ZIP code within 10 miles of 21703 →

Questions about this ZIP code

Where is ZIP code 21703?

21703 is in Frederick, Maryland, in Frederick County, part of the Washington-Arlington-Alexandria, DC-VA-MD-WV metropolitan area. Its published point location is 39.3670, -77.4735.

What county is 21703 in?

21703 lies in Frederick County.

What area code is 21703?

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

What time zone is 21703 in?

21703 uses America/New_York.

How many people live in 21703?

About 41,960 people live in ZIP code 21703, in 15,517 households, at 1,310.0 people per square mile. These are American Community Survey 5-year estimates for the ZIP Code Tabulation Area, not a headcount.

What is the median household income in 21703?

$106,334 a year, against $103,678 across Maryland.

What ZIP codes are near 21703?

The closest are 21717 (3 mi), 21714 (3.6 mi), 21705 (4.5 mi), 21710 (4.6 mi) and 21755 (5.1 mi).

Is 21703 a PO Box ZIP code?

21703 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “21703 ZIP Code — Frederick, Maryland (Frederick County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21703

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