Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

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/20004

20004

ZIP 20004 is in Washington, District of Columbia; area codes 202 and 771; Eastern time. Washington has 271 ZIP codes in all.

Type
Standard
Time zone
America/New_York
Population
1,831
Coordinates
38.8951, -77.0266
☼ Live from 20004 — Washington, DC

Weather right now

Asking the National Weather Service…

NEXRAD radar
Finding the nearest radar…
Local time: —

Where 20004 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 20004
  • 🔢 Type 20004 into a pocket calculator and turn it upside down: hOOOZ — not quite a word, sorry.
  • ➕ As a number, 20,004 = 2 × 2 × 3 × 1667. Its digits add up to 6, a total 90 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 100111000100100
  • 🏠 Its numerical neighbours: 20003 (Washington, DC, 2 mi away) and 20005 (Washington, DC, 1 mi away).
  • 🔄 Backwards, 20004 becomes 40002, which is not a ZIP code at all.
  • 👥 5 other ZIP codes are made of exactly the same digits (02040, 04002, 04020, 20040, 40020). The farthest-flung twin is 04020 in Cornish, ME, 466 miles away.
  • 🧭 Farther south than 52% of all ZIP codes, and farther east than 81%.
  • 🎯1,150 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 20004 and you would come out at 38.90°S, 102.97°E — 868 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 54m of daylight. Shortest: 9h 26m.
  • 📏 At 0.194 square miles of land, 20004 is bigger than 2% of ZIP codes — about 94 football fields.
🌙 The sky over 20004 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population1,831This ZIP1,831
Households1,274This ZIP1,274
Housing units1,629This ZIP1,629
Median age42.2This ZIP42.2District of Columbia34.9US 38.9
Median household income$184,792This ZIP$184,792District of Columbia$109,870US $80,734
Median home value$689,600This ZIP$689,600District of Columbia$737,100US $332,700
Median gross rent$2,997This ZIP$2,997District of Columbia$1,954US $1,413
Bachelor's degree or higher95.6%This ZIP95.6%
Mean commute21.8 minThis ZIP21.8 min
Population density9,438.1 / sq miThis ZIP9,438.1 / sq mi

Business and tax activity

Business establishments883This ZIP883
Employees28,127This ZIP28,127
Annual payroll$4,603,218,000This ZIP$4,603,218,000
Tax returns filed970This ZIP970
Total adjusted gross income$229,522,000This ZIP$229,522,000

Land area

Land area0.19 sq miThis ZIP0.19 sq mi
Water area0.00 sq mi

Other place names in 20004

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

ZIP codes near 20004

ZIPCityDistance
20535 Washington, DC 0.1 mi
20537 Washington, DC 0.1 mi
20073 Washington, DC 0.2 mi
20530 Washington, DC 0.2 mi
20576 Washington, DC 0.2 mi
20412 Washington, DC 0.2 mi
20408 Washington, DC 0.2 mi
20045 Washington, DC 0.3 mi
20531 Washington, DC 0.3 mi
20436 Washington, DC 0.3 mi

Find every ZIP code within 10 miles of 20004 →

Questions about this ZIP code

Where is ZIP code 20004?

20004 is in Washington, District of Columbia, in District of Columbia, part of the Washington-Arlington-Alexandria, DC-VA-MD-WV metropolitan area. Its published point location is 38.8951, -77.0266.

What county is 20004 in?

20004 lies in District of Columbia.

What area code is 20004?

Washington uses area codes 202 and 771, from NANPA's telephone records.

What time zone is 20004 in?

20004 uses America/New_York.

How many people live in 20004?

About 1,831 people live in ZIP code 20004, in 1,274 households, at 9,438.1 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 20004?

$184,792 a year, against $109,870 across District of Columbia.

What ZIP codes are near 20004?

The closest are 20535 (0.1 mi), 20537 (0.1 mi), 20073 (0.2 mi), 20530 (0.2 mi) and 20576 (0.2 mi).

Is 20004 a PO Box ZIP code?

20004 is a standard ZIP code. A normal ZIP code with street delivery.

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zipcodes.pro. “20004 ZIP Code — Washington, District of Columbia.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/20004

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