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/20156

20156

ZIP 20156 is in Gainesville, Virginia, in Prince William County; area codes 571 and 703; Eastern time. Gainesville has 2 ZIP codes; the other is 20155.

Type
No street area
Time zone
America/New_York
Coordinates
38.7219, -77.4669

The Census map gives this ZIP code no delivery area of its own, which usually means it serves post office boxes, a single organization or a post office rather than streets of homes.

This ZIP code has no Census tabulation area of its own. Its point falls inside ZCTA 20112, whose figures describe that area — not this ZIP code.

☼ Live from 20156 — Gainesville, VA

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Local time: —

Where 20156 is

This ZIP code has no Census tabulation area, so there is no boundary to draw — the marker is its published point location.

★ Weird and wonderful facts about 20156
  • 🔢 Type 20156 into a pocket calculator and turn it upside down: gSIOZ — not quite a word, sorry.
  • ➕ As a number, 20,156 = 2 × 2 × 5039. Its digits add up to 14, a total 1,416 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 100111010111100
  • 🏠 Its numerical neighbours: 20155 (Gainesville, VA, 10 mi away) and 20158 (Hamilton, VA, 31 mi away).
  • 🔄 Backwards, 20156 becomes 65102 — and that is a real ZIP code: Jefferson City, MO, 793 miles away.
  • 👥 67 other ZIP codes are made of exactly the same digits (01256, 01526, 01562, 02156, 02561, 02651, …). The farthest-flung twin is 56210 in Barry, MN, 1,083 miles away.
  • 🧭 Farther south than 53% of all ZIP codes, and farther east than 80%.
  • 🎯1,129 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 20156 and you would come out at 38.72°S, 102.53°E — 884 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 53m of daylight. Shortest: 9h 27m.
🌙 The sky over 20156 today
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🌋 Shake report
  • Checking the USGS…

Source: USGS.

Business and tax activity

Business establishments15This ZIP15
Employees67This ZIP67
Annual payroll$3,112,000This ZIP$3,112,000

Land area

ZIP codes near 20156

ZIPCityDistance
20108 Manassas, VA 1.9 mi
20110 Manassas, VA 2.0 mi
20111 Manassas, VA 2.8 mi
20113 Manassas, VA 3.5 mi
20112 Manassas, VA 4.0 mi
20136 Bristow, VA 4.2 mi
20181 Nokesville, VA 5.8 mi
20124 Clifton, VA 5.8 mi
20109 Manassas, VA 6.1 mi
20121 Centreville, VA 6.2 mi

Find every ZIP code within 10 miles of 20156 →

Questions about this ZIP code

Where is ZIP code 20156?

20156 is in Gainesville, Virginia, in Prince William County, part of the Washington-Arlington-Alexandria, DC-VA-MD-WV metropolitan area. Its published point location is 38.7219, -77.4669.

What county is 20156 in?

20156 lies in Prince William County.

What area code is 20156?

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

What time zone is 20156 in?

20156 uses America/New_York.

What ZIP codes are near 20156?

The closest are 20108 (1.9 mi), 20110 (2 mi), 20111 (2.8 mi), 20113 (3.5 mi) and 20112 (4 mi).

Is 20156 a PO Box ZIP code?

Possibly. The Census map gives this ZIP code no delivery area of its own, which usually means it serves post office boxes, a single organization or a post office rather than streets of homes.

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Cite this page

zipcodes.pro. “20156 ZIP Code — Gainesville, Virginia (Prince William County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/20156

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/20156.json

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