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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/20854

20854

ZIP 20854 is in Potomac, Maryland, in Montgomery County; area codes 240, 301 and 227; Eastern time. Potomac has 2 ZIP codes; the other is 20859.

Type
Standard
Time zone
America/New_York
County
Montgomery
Population
50,498
Coordinates
39.0328, -77.2208
☼ Live from 20854 — Potomac, MD

Weather right now

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Local time: —

Where 20854 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 20854
  • 🔢 Type 20854 into a pocket calculator and turn it upside down: hSBOZ — not quite a word, sorry.
  • ➕ As a number, 20,854 = 2 × 10427. Its digits add up to 19, a total 2,454 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 101000101110110
  • 🏠 Its numerical neighbours: 20853 (Rockville, MD, 8 mi away) and 20855 (Derwood, MD, 9 mi away).
  • 🔄 Backwards, 20854 becomes 45802 — and that is a real ZIP code: Lima, OH, 386 miles away.
  • 👥 62 other ZIP codes are made of exactly the same digits (02458, 02584, 04258, 04285, 04852, 05482, …). The farthest-flung twin is 85042 in Phoenix, AZ, 1,969 miles away.
  • 🧭 Farther south than 50% of all ZIP codes, and farther east than 80%.
  • 🎯1,138 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 20854 and you would come out at 39.03°S, 102.78°E — 882 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 55m of daylight. Shortest: 9h 25m.
  • 📏 At 33.8 square miles of land, 20854 is bigger than 49% of ZIP codes — room for about 26 Central Parks.
🌙 The sky over 20854 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population50,498This ZIP50,498
Households16,751This ZIP16,751
Housing units17,311This ZIP17,311
Median age47.7This ZIP47.7Maryland39.4US 38.9
Median household income$250,000+This ZIP$250,000+Maryland$103,678US $80,734
Median home value$1,165,400This ZIP$1,165,400Maryland$419,900US $332,700
Median gross rent$3,500+This ZIP$3,500+Maryland$1,705US $1,413
Bachelor's degree or higher85.7%This ZIP85.7%
Mean commute29.6 minThis ZIP29.6 min
Population density1,491.9 / sq miThis ZIP1,491.9 / sq mi

Business and tax activity

Business establishments1,230This ZIP1,230
Employees12,073This ZIP12,073
Annual payroll$775,964,000This ZIP$775,964,000
Tax returns filed23,150This ZIP23,150
Total adjusted gross income$7,896,741,000This ZIP$7,896,741,000

Land area

Land area33.85 sq miThis ZIP33.85 sq mi
Water area3.03 sq miThis ZIP3.03 sq mi

Other place names in 20854

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

ZIP codes near 20854

ZIPCityDistance
20817 Bethesda, MD 4.4 mi
20850 Rockville, MD 4.5 mi
22066 Great Falls, VA 4.6 mi
22067 Greenway, VA 4.8 mi
20847 Rockville, MD 5.1 mi
20849 Rockville, MD 5.1 mi
20857 Rockville, MD 5.1 mi
20883 Gaithersburg, MD 5.1 mi
20818 Cabin John, MD 5.2 mi
20852 Rockville, MD 5.4 mi

Find every ZIP code within 10 miles of 20854 →

Questions about this ZIP code

Where is ZIP code 20854?

20854 is in Potomac, Maryland, in Montgomery County, part of the Washington-Arlington-Alexandria, DC-VA-MD-WV metropolitan area. Its published point location is 39.0328, -77.2208.

What county is 20854 in?

20854 lies in Montgomery County.

What area code is 20854?

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

What time zone is 20854 in?

20854 uses America/New_York.

How many people live in 20854?

About 50,498 people live in ZIP code 20854, in 16,751 households, at 1,491.9 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 20854?

$250,000+ a year, against $103,678 across Maryland.

What ZIP codes are near 20854?

The closest are 20817 (4.4 mi), 20850 (4.5 mi), 22066 (4.6 mi), 22067 (4.8 mi) and 20847 (5.1 mi).

Is 20854 a PO Box ZIP code?

20854 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “20854 ZIP Code — Potomac, Maryland (Montgomery County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/20854

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