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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/51401

51401

ZIP 51401 is Carroll, Iowa, in Carroll County; area code 712; Central time.

Type
Standard
Time zone
America/Chicago
County
Carroll
Metro area
Carroll, IA
Population
11,990
Coordinates
42.0649, -94.8700
☼ Live from 51401 — Carroll, IA

Weather right now

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Local time: —

Where 51401 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 51401
  • 🔢 Type 51401 into a pocket calculator and turn it upside down: IOhIS — not quite a word, sorry.
  • ➕ As a number, 51,401 = 7 × 7 × 1049. Its digits add up to 11, a total 714 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 1100100011001001
  • 🏠 Its numerical neighbours: 51366 (Webb, IA, 62 mi away) and 51430 (Arcadia, IA, 8 mi away).
  • 🔄 Backwards, 51401 becomes 10415, which is not a ZIP code at all.
  • 👥 33 other ZIP codes are made of exactly the same digits (01451, 01541, 05141, 10154, 10451, 10514, …). The farthest-flung twin is 01451 in Harvard, MA, 1,188 miles away.
  • 🧭 Farther north than 76% of all ZIP codes, and farther west than 68%.
  • 🎯248 miles northeast of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 51401 and you would come out at 42.06°S, 85.13°E — 876 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 15m of daylight. Shortest: 9h 06m.
  • 📏 At 168.5 square miles of land, 51401 is bigger than 88% of ZIP codes — room for about 128 Central Parks.
🌙 The sky over 51401 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population11,990This ZIP11,990
Households5,310This ZIP5,310
Housing units5,670This ZIP5,670
Median age43.0This ZIP43.0Iowa38.6US 38.9
Median household income$70,702This ZIP$70,702Iowa$75,059US $80,734
Median home value$195,700This ZIP$195,700Iowa$208,000US $332,700
Median gross rent$726This ZIP$726Iowa$972US $1,413
Bachelor's degree or higher27.1%This ZIP27.1%
Mean commute12.8 minThis ZIP12.8 min
Population density71.1 / sq miThis ZIP71.1 / sq mi

Business and tax activity

Business establishments541This ZIP541
Employees8,344This ZIP8,344
Annual payroll$410,763,000This ZIP$410,763,000
Tax returns filed5,830This ZIP5,830
Total adjusted gross income$547,680,000This ZIP$547,680,000

Land area

Land area168.53 sq miThis ZIP168.53 sq mi
Water area0.24 sq miThis ZIP0.24 sq mi

Other place names in 51401

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

ZIP codes near 51401

ZIPCityDistance
51452 Lidderdale, IA 5.9 mi
51444 Halbur, IA 6.4 mi
51430 Arcadia, IA 8.2 mi
51443 Glidden, IA 8.9 mi
51440 Dedham, IA 11.0 mi
51436 Breda, IA 11.0 mi
51463 Templeton, IA 11.1 mi
51459 Ralston, IA 12.0 mi
51467 Westside, IA 12.2 mi
51451 Lanesboro, IA 12.2 mi

Find every ZIP code within 10 miles of 51401 →

Questions about this ZIP code

Where is ZIP code 51401?

51401 is in Carroll, Iowa, in Carroll County, part of the Carroll, IA micropolitan area. Its published point location is 42.0649, -94.8700.

What county is 51401 in?

51401 lies in Carroll County.

What area code is 51401?

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

What time zone is 51401 in?

51401 uses America/Chicago.

How many people live in 51401?

About 11,990 people live in ZIP code 51401, in 5,310 households, at 71.1 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 51401?

$70,702 a year, against $75,059 across Iowa.

What ZIP codes are near 51401?

The closest are 51452 (5.9 mi), 51444 (6.4 mi), 51430 (8.2 mi), 51443 (8.9 mi) and 51440 (11 mi).

Is 51401 a PO Box ZIP code?

51401 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “51401 ZIP Code — Carroll, Iowa (Carroll County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/51401

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