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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/51577

51577

ZIP 51577 is Walnut, Iowa, mostly in Pottawattamie County; area code 712; Central time.

Type
Standard
Time zone
America/Chicago
County
Pottawattamie +2 more
Metro area
Omaha, NE-IA
Population
1,561
Coordinates
41.4636, -95.2038
☼ Live from 51577 — Walnut, IA

Weather right now

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Local time: —

Where 51577 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 51577
  • 🔢 Type 51577 into a pocket calculator and turn it upside down: LLSIS — not quite a word, sorry.
  • ➕ 51577 is a prime number. It cannot be divided by anything except 1 and itself. Its digits add up to 25, a total 2,242 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 1100100101111001
  • 🏠 Its numerical neighbours: 51576 (Underwood, IA, 27 mi away) and 51578 (Westphalia, IA, 20 mi away).
  • 🔄 Backwards, 51577 becomes 77515 — and that is a real ZIP code: Angleton, TX, 849 miles away.
  • 👥 13 other ZIP codes are made of exactly the same digits (15757, 15775, 17557, 17575, 55717, 55771, …). The farthest-flung twin is 17557 in New Holland, PA, 1,003 miles away.
  • 🧭 Farther north than 71% of all ZIP codes, and farther west than 69%.
  • 🎯210 miles northeast of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 51577 and you would come out at 41.46°S, 84.80°E — 890 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 11m of daylight. Shortest: 9h 10m.
  • 📏 At 83.6 square miles of land, 51577 is bigger than 73% of ZIP codes — room for about 63 Central Parks.
🌙 The sky over 51577 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population1,561This ZIP1,561
Households406This ZIP406
Housing units460This ZIP460
Median age64.9This ZIP64.9Iowa38.6US 38.9
Median household income$71,518This ZIP$71,518Iowa$75,059US $80,734
Median home value$134,100This ZIP$134,100Iowa$208,000US $332,700
Median gross rent$874This ZIP$874Iowa$972US $1,413
Bachelor's degree or higher16.8%This ZIP16.8%
Mean commute25.3 minThis ZIP25.3 min
Population density18.7 / sq miThis ZIP18.7 / sq mi

Business and tax activity

Business establishments29This ZIP29
Employees90This ZIP90
Annual payroll$3,117,000This ZIP$3,117,000
Tax returns filed480This ZIP480
Total adjusted gross income$34,392,000This ZIP$34,392,000

Land area

Land area83.56 sq miThis ZIP83.56 sq mi
Water area0.02 sq miThis ZIP0.02 sq mi

Counties 51577 spans

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

CountyShare of this ZIP
Pottawattamie County 66.5%
Shelby County 31.2%
Cass County 2.3%

Other place names in 51577

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

ZIP codes near 51577

ZIPCityDistance
51552 Marne, IA 4.9 mi
51521 Avoca, IA 7.4 mi
51593 Harlan, IA 8.6 mi
51536 Hancock, IA 10.3 mi
51531 Elk Horn, IA 10.4 mi
50022 Atlantic, IA 10.7 mi
51544 Lewis, IA 11.6 mi
51537 Harlan, IA 13.8 mi
51570 Shelby, IA 14.2 mi
51560 Oakland, IA 14.6 mi

Find every ZIP code within 10 miles of 51577 →

Questions about this ZIP code

Where is ZIP code 51577?

51577 is in Walnut, Iowa, in Pottawattamie County, part of the Omaha, NE-IA metropolitan area. Its published point location is 41.4636, -95.2038.

What county is 51577 in?

51577 spans 3 counties: Pottawattamie County, Shelby County and Cass 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 51577?

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

What time zone is 51577 in?

51577 uses America/Chicago.

How many people live in 51577?

About 1,561 people live in ZIP code 51577, in 406 households, at 18.7 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 51577?

$71,518 a year, against $75,059 across Iowa.

What ZIP codes are near 51577?

The closest are 51552 (4.9 mi), 51521 (7.4 mi), 51593 (8.6 mi), 51536 (10.3 mi) and 51531 (10.4 mi).

Is 51577 a PO Box ZIP code?

51577 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “51577 ZIP Code — Walnut, Iowa (Pottawattamie County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/51577

Machine-readable version of these facts:

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