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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/20817

20817

ZIP 20817 is in Bethesda, Maryland, in Montgomery County; area codes 240, 301 and 227; Eastern time. Bethesda has 11 ZIP codes in all.

Type
Standard
Time zone
America/New_York
County
Montgomery
Population
37,454
Coordinates
38.9973, -77.1518
☼ Live from 20817 — Bethesda, MD

Weather right now

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Local time: —

Where 20817 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 20817
  • 🔢 Type 20817 into a pocket calculator and turn it upside down: LIBOZ — not quite a word, sorry.
  • ➕ As a number, 20,817 = 3 × 3 × 3 × 3 × 257. Its digits add up to 18, a total 2,332 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 101000101010001
  • 🏠 Its numerical neighbours: 20816 (Bethesda, MD, 3 mi away) and 20818 (Cabin John, MD, 2 mi away).
  • 🔄 Backwards, 20817 becomes 71802 — and that is a real ZIP code: Hope, AR, 985 miles away.
  • 👥 67 other ZIP codes are made of exactly the same digits (01827, 02187, 02718, 02817, 02871, 07821, …). The farthest-flung twin is 87021 in Milan, NM, 1,705 miles away.
  • 🧭 Farther south than 51% of all ZIP codes, and farther east than 81%.
  • 🎯1,143 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 20817 and you would come out at 39.00°S, 102.85°E — 878 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 54m of daylight. Shortest: 9h 26m.
  • 📏 At 14.0 square miles of land, 20817 is bigger than 32% of ZIP codes — room for about 11 Central Parks.
🌙 The sky over 20817 today
  • Working out the sun…
🌋 Shake report
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Source: USGS.

People and housing

Population37,454This ZIP37,454
Households13,660This ZIP13,660
Housing units14,357This ZIP14,357
Median age45.8This ZIP45.8Maryland39.4US 38.9
Median household income$249,332This ZIP$249,332Maryland$103,678US $80,734
Median home value$1,183,600This ZIP$1,183,600Maryland$419,900US $332,700
Median gross rent$3,185This ZIP$3,185Maryland$1,705US $1,413
Bachelor's degree or higher85.6%This ZIP85.6%
Mean commute29.1 minThis ZIP29.1 min
Population density2,668.0 / sq miThis ZIP2,668.0 / sq mi

Business and tax activity

Business establishments1,196This ZIP1,196
Employees28,442This ZIP28,442
Annual payroll$2,685,341,000This ZIP$2,685,341,000
Tax returns filed17,490This ZIP17,490
Total adjusted gross income$5,888,140,000This ZIP$5,888,140,000

Land area

Land area14.04 sq miThis ZIP14.04 sq mi
Water area0.08 sq miThis ZIP0.08 sq mi

Other place names in 20817

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

ZIP codes near 20817

ZIPCityDistance
20818 Cabin John, MD 1.7 mi
20812 Glen Echo, MD 2.1 mi
20892 Bethesda, MD 2.6 mi
20894 Bethesda, MD 2.7 mi
20814 Bethesda, MD 2.7 mi
20810 Bethesda, MD 3.0 mi
20811 Bethesda, MD 3.0 mi
20824 Bethesda, MD 3.0 mi
20816 Bethesda, MD 3.3 mi
20889 Bethesda, MD 3.5 mi

Find every ZIP code within 10 miles of 20817 →

Questions about this ZIP code

Where is ZIP code 20817?

20817 is in Bethesda, Maryland, in Montgomery County, part of the Washington-Arlington-Alexandria, DC-VA-MD-WV metropolitan area. Its published point location is 38.9973, -77.1518.

What county is 20817 in?

20817 lies in Montgomery County.

What area code is 20817?

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

What time zone is 20817 in?

20817 uses America/New_York.

How many people live in 20817?

About 37,454 people live in ZIP code 20817, in 13,660 households, at 2,668.0 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 20817?

$249,332 a year, against $103,678 across Maryland.

What ZIP codes are near 20817?

The closest are 20818 (1.7 mi), 20812 (2.1 mi), 20892 (2.6 mi), 20894 (2.7 mi) and 20814 (2.7 mi).

Is 20817 a PO Box ZIP code?

20817 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “20817 ZIP Code — Bethesda, Maryland (Montgomery County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/20817

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