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/04123

04123

ZIP 04123 is in Portland, Maine, in Cumberland County; area code 207; Eastern time. Portland has 9 ZIP codes in all.

Type
No street area
Time zone
America/New_York
County
Cumberland
Coordinates
43.6615, -70.2553

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 04101, whose figures describe that area — not this ZIP code.

☼ Live from 04123 — Portland, ME

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Where 04123 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 04123
  • 🔢 Type 04123 into a pocket calculator and turn it upside down: EZIhO — not quite a word, sorry.
  • ➕ As a number, 4,123 = 7 × 19 × 31. Its digits add up to 10, a total 513 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 1000000011011
  • 🏠 Its numerical neighbours: 04122 (Portland, ME, 0 mi away) and 04124 (Portland, ME, 0 mi away).
  • 🔄 Backwards, 04123 becomes 32140 — and that is a real ZIP code: Florahome, FL, 1,153 miles away.
  • 👥 68 other ZIP codes are made of exactly the same digits (01243, 01342, 01432, 02134, 02143, 02341, …). The farthest-flung twin is 34021 in APO AA, a military post office, 2,378 miles away.
  • 🧭 Farther north than 86% of all ZIP codes, and farther east than 97%.
  • 🎯1,477 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 04123 and you would come out at 43.66°S, 109.74°E — 875 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 27m of daylight. Shortest: 8h 55m.
🌙 The sky over 04123 today
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Source: USGS.

Land area

ZIP codes near 04123

ZIPCityDistance
04104 Portland, ME 0.0 mi
04112 Portland, ME 0.0 mi
04122 Portland, ME 0.0 mi
04124 Portland, ME 0.0 mi
04101 Portland, ME 0.2 mi
04116 South Portland, ME 1.6 mi
04109 Portland, ME 1.7 mi
04102 Portland, ME 2.2 mi
04106 South Portland, ME 2.6 mi
04103 Portland, ME 2.9 mi

Find every ZIP code within 10 miles of 04123 →

Questions about this ZIP code

Where is ZIP code 04123?

04123 is in Portland, Maine, in Cumberland County, part of the Portland-South Portland, ME metropolitan area. Its published point location is 43.6615, -70.2553.

What county is 04123 in?

04123 lies in Cumberland County.

What area code is 04123?

Portland uses area code 207, from NANPA's telephone records.

What time zone is 04123 in?

04123 uses America/New_York.

What ZIP codes are near 04123?

The closest are 04104 (0 mi), 04112 (0 mi), 04122 (0 mi), 04124 (0 mi) and 04101 (0.2 mi).

Is 04123 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. “04123 ZIP Code — Portland, Maine (Cumberland County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/04123

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