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/20121

20121

ZIP 20121 is in Centreville, Virginia, in Fairfax County; area codes 571 and 703; Eastern time. Centreville has 3 ZIP codes; the others are 20120 and 20122.

Type
Standard
Time zone
America/New_York
County
Fairfax
Population
27,788
Coordinates
38.8110, -77.4629
☼ Live from 20121 — Centreville, VA

Weather right now

Asking the National Weather Service…

NEXRAD radar
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Local time: —

Where 20121 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 20121
  • 🔢 Type 20121 into a pocket calculator and turn it upside down: IZIOZ — not quite a word, sorry.
  • ➕ As a number, 20,121 = 3 × 19 × 353. Its digits add up to 6, a total 90 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 100111010011001
  • 🏠 Its numerical neighbours: 20120 (Centreville, VA, 3 mi away) and 20122 (Centreville, VA, 9 mi away).
  • 🔄 Backwards, 20121 becomes 12102, which is not a ZIP code at all.
  • 👥 19 other ZIP codes are made of exactly the same digits (02112, 02121, 02211, 10122, 10212, 11022, …). The farthest-flung twin is 02112 in Boston, MA, 416 miles away.
  • 🧭 Farther south than 53% of all ZIP codes, and farther east than 80%.
  • 🎯1,128 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 20121 and you would come out at 38.81°S, 102.54°E — 886 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 53m of daylight. Shortest: 9h 27m.
  • 📏 At 8.7 square miles of land, 20121 is bigger than 25% of ZIP codes — room for about 6.6 Central Parks.
🌙 The sky over 20121 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population27,788This ZIP27,788
Households9,891This ZIP9,891
Housing units10,057This ZIP10,057
Median age36.1This ZIP36.1Virginia39.0US 38.9
Median household income$129,947This ZIP$129,947Virginia$93,170US $80,734
Median home value$520,200This ZIP$520,200Virginia$383,700US $332,700
Median gross rent$2,289This ZIP$2,289Virginia$1,579US $1,413
Bachelor's degree or higher53.8%This ZIP53.8%
Mean commute29.6 minThis ZIP29.6 min
Population density3,208.8 / sq miThis ZIP3,208.8 / sq mi

Business and tax activity

Business establishments629This ZIP629
Employees6,063This ZIP6,063
Annual payroll$266,140,000This ZIP$266,140,000
Tax returns filed14,530This ZIP14,530
Total adjusted gross income$1,259,235,000This ZIP$1,259,235,000

Land area

Land area8.66 sq miThis ZIP8.66 sq mi
Water area0.52 sq miThis ZIP0.52 sq mi

Other place names in 20121

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

ZIP codes near 20121

ZIPCityDistance
20113 Manassas, VA 2.9 mi
20120 Centreville, VA 3.4 mi
20109 Manassas, VA 3.8 mi
20124 Clifton, VA 4.4 mi
20110 Manassas, VA 4.7 mi
20111 Manassas, VA 4.7 mi
20108 Manassas, VA 4.8 mi
20151 Chantilly, VA 6.0 mi
22033 Fairfax, VA 6.1 mi
20156 Gainesville, VA 6.2 mi

Find every ZIP code within 10 miles of 20121 →

Questions about this ZIP code

Where is ZIP code 20121?

20121 is in Centreville, Virginia, in Fairfax County, part of the Washington-Arlington-Alexandria, DC-VA-MD-WV metropolitan area. Its published point location is 38.8110, -77.4629.

What county is 20121 in?

20121 lies in Fairfax County.

What area code is 20121?

Centreville uses area codes 571 and 703, from NANPA's telephone records.

What time zone is 20121 in?

20121 uses America/New_York.

How many people live in 20121?

About 27,788 people live in ZIP code 20121, in 9,891 households, at 3,208.8 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 20121?

$129,947 a year, against $93,170 across Virginia.

What ZIP codes are near 20121?

The closest are 20113 (2.9 mi), 20120 (3.4 mi), 20109 (3.8 mi), 20124 (4.4 mi) and 20110 (4.7 mi).

Is 20121 a PO Box ZIP code?

20121 is a standard ZIP code. A normal ZIP code with street delivery.

Download or cite

Cite this page

zipcodes.pro. “20121 ZIP Code — Centreville, Virginia (Fairfax County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/20121

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/20121.json

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