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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/51243

51243

ZIP 51243 is Little Rock, Iowa, mostly in Lyon County; area code 712; Central time.

Type
Standard
Time zone
America/Chicago
County
Lyon +1 more
Metro area
none
Population
735
Coordinates
43.4406, -95.8966
☼ Live from 51243 — Little Rock, IA

Weather right now

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Local time: —

Where 51243 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 51243
  • 🔢 Type 51243 into a pocket calculator and turn it upside down: EhZIS — not quite a word, sorry.
  • ➕ As a number, 51,243 = 3 × 19 × 29 × 31. Its digits add up to 15, a total 1,657 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 1100100000101011
  • 🏠 Its numerical neighbours: 51242 (Lester, IA, 22 mi away) and 51244 (Matlock, IA, 14 mi away).
  • 🔄 Backwards, 51243 becomes 34215 — and that is a real ZIP code: Cortez, FL, 1,327 miles away.
  • 👥 66 other ZIP codes are made of exactly the same digits (12345, 12435, 12453, 12534, 12543, 13425, …). The farthest-flung twin is 34251 in Myakka City, FL, 1,348 miles away.
  • 🧭 Farther north than 85% of all ZIP codes, and farther west than 71%.
  • 🎯285 miles northeast of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 51243 and you would come out at 43.44°S, 84.10°E — 776 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 25m of daylight. Shortest: 8h 57m.
  • 📏 At 52.3 square miles of land, 51243 is bigger than 61% of ZIP codes — room for about 40 Central Parks.
🌙 The sky over 51243 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population735This ZIP735
Households294This ZIP294
Housing units310This ZIP310
Median age40.8This ZIP40.8Iowa38.6US 38.9
Median household income$83,750This ZIP$83,750Iowa$75,059US $80,734
Median home value$92,200This ZIP$92,200Iowa$208,000US $332,700
Median gross rent$608This ZIP$608Iowa$972US $1,413
Bachelor's degree or higher18.0%This ZIP18.0%
Mean commute21.9 minThis ZIP21.9 min
Population density14.1 / sq miThis ZIP14.1 / sq mi

Business and tax activity

Business establishments19This ZIP19
Employees76This ZIP76
Annual payroll$3,242,000This ZIP$3,242,000
Tax returns filed330This ZIP330
Total adjusted gross income$24,575,000This ZIP$24,575,000

Land area

Land area52.30 sq miThis ZIP52.30 sq mi
Water area0.01 sq miThis ZIP0.01 sq mi

Counties 51243 spans

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

CountyShare of this ZIP
Lyon County 86.0%
Osceola County 14.0%

Other place names in 51243

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

ZIP codes near 51243

ZIPCityDistance
51249 Sibley, IA 8.6 mi
51237 George, IA 8.9 mi
56129 Ellsworth, MN 9.5 mi
51232 Ashton, IA 11.0 mi
56117 Bigelow, MN 11.9 mi
56168 Rushmore, MN 12.6 mi
56110 Adrian, MN 12.8 mi
51246 Rock Rapids, IA 13.5 mi
51244 Matlock, IA 13.7 mi
56146 Kanaranzi, MN 14.2 mi

Find every ZIP code within 10 miles of 51243 →

Questions about this ZIP code

Where is ZIP code 51243?

51243 is in Little Rock, Iowa, in Lyon County. Its published point location is 43.4406, -95.8966.

What county is 51243 in?

51243 spans 2 counties: Lyon County and Osceola County. Most of it falls in Lyon 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 51243?

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

What time zone is 51243 in?

51243 uses America/Chicago.

How many people live in 51243?

About 735 people live in ZIP code 51243, in 294 households, at 14.1 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 51243?

$83,750 a year, against $75,059 across Iowa.

What ZIP codes are near 51243?

The closest are 51249 (8.6 mi), 51237 (8.9 mi), 56129 (9.5 mi), 51232 (11 mi) and 56117 (11.9 mi).

Is 51243 a PO Box ZIP code?

51243 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “51243 ZIP Code — Little Rock, Iowa (Lyon County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/51243

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