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/06504

06504

ZIP 06504 is in New Haven, Connecticut, in New Haven County; area codes 203 and 475; Eastern time. New Haven has 28 ZIP codes in all.

Type
No street area
Time zone
America/New_York
County
New Haven
Metro area
none
Coordinates
41.3657, -72.9275

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 06514, whose figures describe that area — not this ZIP code.

☼ Live from 06504 — New Haven, CT

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Where 06504 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 06504
  • 🔢 Type 06504 into a pocket calculator and turn it upside down: hOSgO — not quite a word, sorry.
  • ➕ As a number, 6,504 = 2 × 2 × 2 × 3 × 271. Its digits add up to 15, a total 1,657 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 1100101101000
  • 🏠 Its numerical neighbours: 06503 (New Haven, CT, 4 mi away) and 06505 (New Haven, CT, 4 mi away).
  • 🔄 Backwards, 06504 becomes 40560, which is not a ZIP code at all.
  • 👥 27 other ZIP codes are made of exactly the same digits (04056, 04605, 04650, 05046, 05406, 05460, …). The farthest-flung twin is 64050 in Independence, MO, 1,141 miles away.
  • 🧭 Farther north than 70% of all ZIP codes, and farther east than 93%.
  • 🎯1,345 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 06504 and you would come out at 41.37°S, 107.07°E — 812 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 10m of daylight. Shortest: 9h 11m.
🌙 The sky over 06504 today
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Source: USGS.

Land area

ZIP codes near 06504

ZIPCityDistance
06408 Cheshire, CT 0.0 mi
06493 Wallingford, CT 0.0 mi
06494 Wallingford, CT 0.0 mi
06537 New Haven, CT 0.0 mi
06538 New Haven, CT 0.0 mi
06514 Hamden, CT 1.1 mi
06517 Hamden, CT 1.5 mi
06495 Wallingford, CT 2.9 mi
06511 New Haven, CT 3.3 mi
06515 New Haven, CT 3.4 mi

Find every ZIP code within 10 miles of 06504 →

Questions about this ZIP code

Where is ZIP code 06504?

06504 is in New Haven, Connecticut, in New Haven County. Its published point location is 41.3657, -72.9275.

What county is 06504 in?

06504 lies in New Haven County.

What area code is 06504?

New Haven uses area codes 203 and 475, from NANPA's telephone records.

What time zone is 06504 in?

06504 uses America/New_York.

What ZIP codes are near 06504?

The closest are 06408 (0 mi), 06493 (0 mi), 06494 (0 mi), 06537 (0 mi) and 06538 (0 mi).

Is 06504 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. “06504 ZIP Code — New Haven, Connecticut (New Haven County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/06504

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/06504.json

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