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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/20905

20905

ZIP 20905 is in Silver Spring, Maryland, in Montgomery County; Eastern time. Silver Spring has 16 ZIP codes in all.

Type
Standard
Time zone
America/New_York
County
Montgomery
Population
19,004
Coordinates
39.1099, -76.9881
☼ Live from 20905 — Silver Spring, MD

Weather right now

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NEXRAD radar
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Local time: —

Where 20905 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 20905
  • 🔢 Type 20905 into a pocket calculator and turn it upside down: SOGOZ — not quite a word, sorry.
  • ➕ As a number, 20,905 = 5 × 37 × 113. Its digits add up to 16, a total 1,922 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 101000110101001
  • 🏠 Its numerical neighbours: 20904 (Silver Spring, MD, 3 mi away) and 20906 (Silver Spring, MD, 4 mi away).
  • 🔄 Backwards, 20905 becomes 50902, which is not a ZIP code at all.
  • 👥 23 other ZIP codes are made of exactly the same digits (00925, 00952, 02059, 02905, 05902, 09025, …). The farthest-flung twin is 09250 in APO AE, a military post office, 4,147 miles away.
  • 🧭 Farther south than 50% of all ZIP codes, and farther east than 82%.
  • 🎯1,150 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 20905 and you would come out at 39.11°S, 103.01°E — 874 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 55m of daylight. Shortest: 9h 25m.
  • 📏 At 11.8 square miles of land, 20905 is bigger than 29% of ZIP codes — room for about 8.9 Central Parks.
🌙 The sky over 20905 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population19,004This ZIP19,004
Households5,899This ZIP5,899
Housing units6,119This ZIP6,119
Median age44.8This ZIP44.8Maryland39.4US 38.9
Median household income$159,740This ZIP$159,740Maryland$103,678US $80,734
Median home value$656,700This ZIP$656,700Maryland$419,900US $332,700
Median gross rent$2,105This ZIP$2,105Maryland$1,705US $1,413
Bachelor's degree or higher56.9%This ZIP56.9%
Mean commute35.3 minThis ZIP35.3 min
Population density1,612.4 / sq miThis ZIP1,612.4 / sq mi

Business and tax activity

Business establishments299This ZIP299
Employees1,902This ZIP1,902
Annual payroll$89,725,000This ZIP$89,725,000
Tax returns filed9,110This ZIP9,110
Total adjusted gross income$1,077,407,000This ZIP$1,077,407,000

Land area

Land area11.79 sq miThis ZIP11.79 sq mi
Water area0.10 sq miThis ZIP0.10 sq mi

Other place names in 20905

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

ZIP codes near 20905

ZIPCityDistance
20868 Spencerville, MD 1.8 mi
20861 Ashton, MD 2.7 mi
20904 Silver Spring, MD 2.8 mi
20866 Burtonsville, MD 2.9 mi
20860 Sandy Spring, MD 3.8 mi
20906 Silver Spring, MD 3.9 mi
20759 Fulton, MD 4.3 mi
20777 Highland, MD 4.6 mi
20862 Brinklow, MD 5.1 mi
20830 Olney, MD 5.3 mi

Find every ZIP code within 10 miles of 20905 →

Questions about this ZIP code

Where is ZIP code 20905?

20905 is in Silver Spring, Maryland, in Montgomery County, part of the Washington-Arlington-Alexandria, DC-VA-MD-WV metropolitan area. Its published point location is 39.1099, -76.9881.

What county is 20905 in?

20905 lies in Montgomery County.

What time zone is 20905 in?

20905 uses America/New_York.

How many people live in 20905?

About 19,004 people live in ZIP code 20905, in 5,899 households, at 1,612.4 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 20905?

$159,740 a year, against $103,678 across Maryland.

What ZIP codes are near 20905?

The closest are 20868 (1.8 mi), 20861 (2.7 mi), 20904 (2.8 mi), 20866 (2.9 mi) and 20860 (3.8 mi).

Is 20905 a PO Box ZIP code?

20905 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “20905 ZIP Code — Silver Spring, Maryland (Montgomery County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/20905

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