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/51603

51603

ZIP 51603 is in Shenandoah, Iowa, in Page County; area code 712; Central time. Shenandoah has 2 ZIP codes; the other is 51601.

Type
No street area
Time zone
America/Chicago
County
Page
Metro area
none
Coordinates
40.7656, -95.3722

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 51601, whose figures describe that area — not this ZIP code.

☼ Live from 51603 — Shenandoah, IA

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Where 51603 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 51603
  • 🔢 Type 51603 into a pocket calculator and turn it upside down: EOgIS — not quite a word, sorry.
  • ➕ As a number, 51,603 = 3 × 103 × 167. Its digits add up to 15, a total 1,657 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 1100100110010011
  • 🏠 Its numerical neighbours: 51601 (Shenandoah, IA, 2 mi away) and 51630 (Blanchard, IA, 15 mi away).
  • 🔄 Backwards, 51603 becomes 30615, which is not a ZIP code at all.
  • 👥 66 other ZIP codes are made of exactly the same digits (01536, 01653, 03561, 05361, 06153, 06351, …). The farthest-flung twin is 01536 in North Grafton, MA, 1,226 miles away.
  • 🧭 Farther north than 64% of all ZIP codes, and farther west than 69%.
  • 🎯181 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 51603 and you would come out at 40.77°S, 84.63°E — 917 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 06m of daylight. Shortest: 9h 15m.
🌙 The sky over 51603 today
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🌋 Shake report
  • Checking the USGS…

Source: USGS.

Land area

ZIP codes near 51603

ZIPCityDistance
51601 Shenandoah, IA 2.5 mi
51639 Farragut, IA 5.9 mi
51638 Essex, IA 7.4 mi
51645 Imogene, IA 8.5 mi
51636 Coin, IA 9.9 mi
51649 Randolph, IA 10.0 mi
51650 Riverton, IA 11.1 mi
51647 Northboro, IA 11.2 mi
51656 Yorktown, IA 11.6 mi
51652 Sidney, IA 13.1 mi

Find every ZIP code within 10 miles of 51603 →

Questions about this ZIP code

Where is ZIP code 51603?

51603 is in Shenandoah, Iowa, in Page County. Its published point location is 40.7656, -95.3722.

What county is 51603 in?

51603 lies in Page County.

What area code is 51603?

Shenandoah uses area code 712, from NANPA's telephone records.

What time zone is 51603 in?

51603 uses America/Chicago.

What ZIP codes are near 51603?

The closest are 51601 (2.5 mi), 51639 (5.9 mi), 51638 (7.4 mi), 51645 (8.5 mi) and 51636 (9.9 mi).

Is 51603 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. “51603 ZIP Code — Shenandoah, Iowa (Page County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/51603

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curl https://zipcodes.pro/zip/51603.json

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