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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/51561

51561

ZIP 51561 is Pacific Junction, Iowa, in Mills County; area code 712; Central time.

Type
Standard
Time zone
America/Chicago
County
Mills
Metro area
Omaha, NE-IA
Population
1,039
Coordinates
41.0051, -95.8096
☼ Live from 51561 — Pacific Junction, IA

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Where 51561 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 51561
  • 🔢 Type 51561 into a pocket calculator and turn it upside down: IgSIS — not quite a word, sorry.
  • ➕ As a number, 51,561 = 3 × 3 × 17 × 337. Its digits add up to 18, a total 2,332 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 1100100101101001
  • 🏠 Its numerical neighbours: 51560 (Oakland, IA, 30 mi away) and 51562 (Panama, IA, 52 mi away).
  • 🔄 Backwards, 51561 becomes 16515 — and that is a real ZIP code: Erie, PA, 816 miles away.
  • 👥 11 other ZIP codes are made of exactly the same digits (11556, 11565, 15561, 15615, 16155, 16515, …). The farthest-flung twin is 11556 in Uniondale, NY, 1,158 miles away.
  • 🧭 Farther north than 67% of all ZIP codes, and farther west than 71%.
  • 🎯167 miles northeast of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 51561 and you would come out at 41.01°S, 84.19°E — 889 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 08m of daylight. Shortest: 9h 13m.
  • 📏 At 56.1 square miles of land, 51561 is bigger than 63% of ZIP codes — room for about 43 Central Parks.
🌙 The sky over 51561 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population1,039This ZIP1,039
Households374This ZIP374
Housing units473This ZIP473
Median age47.8This ZIP47.8Iowa38.6US 38.9
Median household income$113,421This ZIP$113,421Iowa$75,059US $80,734
Median home value$388,800This ZIP$388,800Iowa$208,000US $332,700
Median gross rent$1,103This ZIP$1,103Iowa$972US $1,413
Bachelor's degree or higher37.7%This ZIP37.7%
Mean commute18.6 minThis ZIP18.6 min
Population density18.5 / sq miThis ZIP18.5 / sq mi

Business and tax activity

Business establishments23This ZIP23
Employees283This ZIP283
Annual payroll$19,153,000This ZIP$19,153,000
Tax returns filed440This ZIP440
Total adjusted gross income$34,449,000This ZIP$34,449,000

Land area

Land area56.14 sq miThis ZIP56.14 sq mi
Water area1.65 sq miThis ZIP1.65 sq mi

Other place names in 51561

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

ZIP codes near 51561

ZIPCityDistance
51534 Glenwood, IA 5.4 mi
68048 Plattsmouth, NE 7.1 mi
68113 Offutt Afb, NE 9.3 mi
68123 Bellevue, NE 9.8 mi
68409 Murray, NE 10.1 mi
68005 Bellevue, NE 10.4 mi
68056 St Columbans, NE 10.6 mi
51653 Tabor, IA 11.0 mi
51551 Malvern, IA 11.6 mi
51554 Mineola, IA 11.8 mi

Find every ZIP code within 10 miles of 51561 →

Questions about this ZIP code

Where is ZIP code 51561?

51561 is in Pacific Junction, Iowa, in Mills County, part of the Omaha, NE-IA metropolitan area. Its published point location is 41.0051, -95.8096.

What county is 51561 in?

51561 lies in Mills County.

What area code is 51561?

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

What time zone is 51561 in?

51561 uses America/Chicago.

How many people live in 51561?

About 1,039 people live in ZIP code 51561, in 374 households, at 18.5 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 51561?

$113,421 a year, against $75,059 across Iowa.

What ZIP codes are near 51561?

The closest are 51534 (5.4 mi), 68048 (7.1 mi), 68113 (9.3 mi), 68123 (9.8 mi) and 68409 (10.1 mi).

Is 51561 a PO Box ZIP code?

51561 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “51561 ZIP Code — Pacific Junction, Iowa (Mills County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/51561

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