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/51503

51503

ZIP 51503 is in Council Bluffs, Iowa, mostly in Pottawattamie County; area code 712; Central time. Council Bluffs has 3 ZIP codes; the others are 51501 and 51502.

Type
Standard
Time zone
America/Chicago
County
Pottawattamie +1 more
Metro area
Omaha, NE-IA
Population
37,972
Coordinates
41.2232, -95.7845
☼ Live from 51503 — Council Bluffs, IA

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Local time: —

Where 51503 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 51503
  • 🔢 Type 51503 into a pocket calculator and turn it upside down: EOSIS — not quite a word, sorry.
  • ➕ 51503 is a prime number. It cannot be divided by anything except 1 and itself. Its digits add up to 14, a total 1,416 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 1100100100101111
  • 🏠 Its numerical neighbours: 51502 (Council Bluffs, IA, 5 mi away) and 51510 (Carter Lake, IA, 8 mi away).
  • 🔄 Backwards, 51503 becomes 30515 — and that is a real ZIP code: Buford, GA, 814 miles away.
  • 👥 38 other ZIP codes are made of exactly the same digits (01355, 01535, 05153, 05351, 10535, 10553, …). The farthest-flung twin is 01535 in North Brookfield, MA, 1,221 miles away.
  • 🧭 Farther north than 69% of all ZIP codes, and farther west than 71%.
  • 🎯176 miles northeast of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 51503 and you would come out at 41.22°S, 84.22°E — 880 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 09m of daylight. Shortest: 9h 12m.
  • 📏 At 121.7 square miles of land, 51503 is bigger than 82% of ZIP codes — room for about 92 Central Parks.
🌙 The sky over 51503 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population37,972This ZIP37,972
Households15,442This ZIP15,442
Housing units16,425This ZIP16,425
Median age40.6This ZIP40.6Iowa38.6US 38.9
Median household income$79,010This ZIP$79,010Iowa$75,059US $80,734
Median home value$262,300This ZIP$262,300Iowa$208,000US $332,700
Median gross rent$991This ZIP$991Iowa$972US $1,413
Bachelor's degree or higher30.5%This ZIP30.5%
Mean commute18.7 minThis ZIP18.7 min
Population density312.1 / sq miThis ZIP312.1 / sq mi

Business and tax activity

Business establishments721This ZIP721
Employees10,010This ZIP10,010
Annual payroll$479,760,000This ZIP$479,760,000
Tax returns filed16,990This ZIP16,990
Total adjusted gross income$1,472,938,000This ZIP$1,472,938,000

Land area

Land area121.68 sq miThis ZIP121.68 sq mi
Water area1.49 sq miThis ZIP1.49 sq mi

Counties 51503 spans

A ZIP code is a mail route and ignores county lines. Shares are by overlapping land area.

CountyShare of this ZIP
Pottawattamie County 84.6%
Mills County 15.4%

Other place names in 51503

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

ZIP codes near 51503

ZIPCityDistance
51502 Council Bluffs, IA 4.8 mi
51501 Council Bluffs, IA 4.9 mi
51554 Mineola, IA 7.6 mi
68108 Omaha, NE 7.7 mi
68110 Omaha, NE 7.8 mi
68005 Bellevue, NE 8.0 mi
68102 Omaha, NE 8.1 mi
51510 Carter Lake, IA 8.2 mi
68101 Omaha, NE 8.3 mi
68103 Omaha, NE 8.3 mi

Find every ZIP code within 10 miles of 51503 →

Questions about this ZIP code

Where is ZIP code 51503?

51503 is in Council Bluffs, Iowa, in Pottawattamie County, part of the Omaha, NE-IA metropolitan area. Its published point location is 41.2232, -95.7845.

What county is 51503 in?

51503 spans 2 counties: Pottawattamie County and Mills County. Most of it falls in Pottawattamie County, measured by overlapping land area — the county holding the most land in a ZIP code is not always the one holding the most residents.

What area code is 51503?

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

What time zone is 51503 in?

51503 uses America/Chicago.

How many people live in 51503?

About 37,972 people live in ZIP code 51503, in 15,442 households, at 312.1 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 51503?

$79,010 a year, against $75,059 across Iowa.

What ZIP codes are near 51503?

The closest are 51502 (4.8 mi), 51501 (4.9 mi), 51554 (7.6 mi), 68108 (7.7 mi) and 68110 (7.8 mi).

Is 51503 a PO Box ZIP code?

51503 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “51503 ZIP Code — Council Bluffs, Iowa (Pottawattamie County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/51503

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